Neurology | Spinal Cord: White Matter Structure & Function
Summary
TLDRThis educational video offers an in-depth exploration of the spinal cord's white matter, focusing on its structure and function. It explains the concept of white matter as myelinated axons and introduces the term 'tract' as bundles of axons in the central nervous system. The video outlines the anatomy of the white matter in the spinal cord, including dorsal, lateral, and ventral columns, and discusses the ascending and descending tracks that carry sensory and motor information. It provides a detailed overview of specific tracts like the tract of Lissauer, corticospinal, reticulospinal, and spinothalamic tracts, emphasizing their roles in pain, temperature, touch, and motor control. The script also highlights the somatotopic organization of these tracts, crucial for understanding the implications of spinal cord injuries.
Takeaways
- 🧠 The white matter of the spinal cord is primarily composed of myelinated axons, which give it a whitish appearance.
- 🌐 Myelin sheaths are lipid-protein layers that insulate axons and facilitate the rapid transmission of action potentials.
- 🔄 A tract, or fasciculus, is a bundle of axons in the central nervous system that transmits information either ascending (sensory) or descending (motor).
- 🌱 The white matter is anatomically divided into dorsal (posterior), lateral, and ventral (anterior) columns relative to the gray matter of the spinal cord.
- ➡️ Ascending tracts carry sensory information up the spinal cord, such as the spinothalamic tracts responsible for pain and temperature sensations.
- 🔽 Descending tracts, like the corticospinal tracts, carry motor information down the spinal cord to stimulate voluntary muscle control.
- 🔄 The tract of Lissauer is involved in the pain and temperature pathway, with fibers ascending or descending one or two segments before synapsing in the posterior gray horn.
- 🏃♂️ The lateral corticospinal tract is the most significant descending motor tract, responsible for voluntary control of skeletal muscles.
- 🦾 The somatotopic arrangement of the lateral corticospinal and spinothalamic tracts places the sacral region laterally, followed by lumbar, thoracic, and cervical.
- 👣 The dorsal column contains only ascending tracts, specifically the fasciculus gracilis and fasciculus cuneatus, which transmit fine touch, vibration, and proprioceptive sensations.
- 🧍 The anterior spinothalamic tract in the ventral column carries crude touch and pressure sensations.
Q & A
What is white matter in the context of the spinal cord?
-White matter in the spinal cord refers to the myelinated axons, which give the tissue its whitish appearance due to the myelin sheaths that insulate the axons and facilitate quick transmission of action potentials.
What is the function of the myelin sheath in neurons?
-The myelin sheath serves as an insulating layer around the axon of a neuron, allowing for faster transmission of action potentials along the axon.
What is a tract in the context of the central nervous system?
-A tract is a bundle of axons within the central nervous system that facilitates the transmission of information either ascending (upwards) or descending (downwards).
What are the different columns of white matter in the spinal cord?
-The different columns of white matter in the spinal cord are the dorsal white column (posterior to the gray matter), the lateral white column (on the sides), and the ventral white column (anterior to the gray matter).
What is the anterior white commissure and its significance?
-The anterior white commissure is a structure in the spinal cord where crossing of fibers occurs, allowing for the transmission of information across different sides of the spinal cord.
What is the function of the tract of Lissauer and how does it relate to pain and temperature sensations?
-The tract of Lissauer is involved in the pain and temperature pathway. It allows these sensory fibers to ascend or descend one or two spinal cord segments before synapsing on the cell bodies in the posterior gray horn, which is important for understanding the levels affected by a lesion in the spinal cord.
What is the primary descending motor tract in the lateral white column of the spinal cord?
-The primary descending motor tract in the lateral white column is the lateral corticospinal tract, which is crucial for voluntary control of skeletal muscles.
What are the two main ascending tracts in the dorsal white column of the spinal cord?
-The two main ascending tracts in the dorsal white column are the fasciculus gracilis and the fasciculus cuneatus, which are responsible for carrying fine touch, vibration, and proprioceptive sensations.
What is the somatotopic arrangement of the lateral corticospinal tract and its significance?
-The somatotopic arrangement of the lateral corticospinal tract places the legs laterally, with sacral motor supply being the farthest lateral, followed by lumbar, thoracic, and cervical. This arrangement is significant for understanding the impact of lesions on specific body regions.
What types of sensations are carried by the dorsal spinocerebellar and ventral spinocerebellar tracts?
-The dorsal and ventral spinocerebellar tracts primarily carry proprioceptive sensations, which provide information about the position and movement of the body in space.
Outlines
🧠 Introduction to White Matter of the Spinal Cord
The video script begins with an introduction to the white matter of the spinal cord, explaining its basic structure and function. It clarifies what white matter is, emphasizing the role of myelin sheaths in giving the axons a whitish appearance. The script then defines a tract as a bundle of axons in the central nervous system. The anatomy of the spinal cord's white matter is outlined, identifying the dorsal, lateral, and ventral white columns, also known as funiculi. The anterior white commissure, where fiber crossing occurs, is also introduced.
🔍 Ascending and Descending Tracts in the Spinal Cord
This paragraph delves into the functions of the white matter in the spinal cord, focusing on the ascending and descending tracts. Ascending tracts are responsible for carrying sensory information, while descending tracts are involved in motor information. The script introduces the tract of Lasauer, which plays a role in the pain and temperature pathway, allowing these sensations to ascend or descend one or two spinal cord segments before synapsing in the posterior gray horn. The importance of this pathway is highlighted in relation to the impact of lesions on sensory and motor functions.
🚀 Descending Motor Tracts in the White Matter
The script provides an in-depth look at the descending motor tracts in the spinal cord's white matter. It identifies the lateral corticospinal tract as the most significant tract in the lateral white column, responsible for voluntary control of skeletal muscles. The rubrospinal tract is also mentioned as another descending motor tract in the lateral column. Moving to the ventral white column, the script describes several tracts including the lateral and medial reticulospinal tracts, the vestibulospinal tract, the tectospinal tract, and the anterior corticospinal tract. The somatotopic arrangement of the lateral corticospinal tract is explained, detailing the organization of motor neurons based on the body regions they supply.
🌐 Ascending Sensory Tracts in the White Matter
The focus shifts to the ascending sensory tracts within the white matter of the spinal cord. The dorsal column, which contains only ascending tracts, is highlighted with the fasciculus gracilis and fasciculus cuneatus being introduced. These tracts are responsible for carrying sensations related to fine touch, vibrations, and proprioception. The script also covers the ascending tracts in the lateral white column, including the dorsal and ventral spinocerebellar tracts, the spino olivary tract, and the lateral spinothalamic tract, each with specific roles in sensory processing. The anterior white column is noted to contain only one ascending tract, the anterior spinothalamic tract, which carries crude touch and pressure sensations.
🔬 Basic Functions of White Matter Tracts
This paragraph summarizes the basic functions of the white matter tracts discussed in the script. The dorsal column's fasciculus gracilis and fasciculus cuneatus are associated with sensations from the lower and upper extremities, respectively. The lateral corticospinal tract in the lateral white column is responsible for voluntary muscle control, while the rubrospinal tract influences limb flexors. The spinocerebellar tracts are linked to proprioception, and the spinothalamic tracts are involved in pain and temperature sensations. The anterior white column's descending motor tracts are also mentioned, with their roles in muscle control and the single sensory tract's function in crude touch and pressure sensation.
🎓 Conclusion on the White Matter of the Spinal Cord
The script concludes with a recap of the white matter of the spinal cord's anatomy and function. It emphasizes the importance of understanding the structure and function of white matter for neurological studies and clinical practice. The video encourages viewers to explore more detailed videos in the neurology playlist for further understanding. The script ends with an invitation for viewers to like, comment, and subscribe for more educational content.
Mindmap
Keywords
💡White Matter
💡Axons
💡Myelin Sheaths
💡Neuron
💡Ascending Tracks
💡Descending Tracks
💡Spinal Cord
💡Funiculus
💡Somatotopic Arrangement
💡Lateral Corticospinal Tract
💡Spinothalamic Tract
Highlights
Introduction to the white matter of the spinal cord and its significance.
Explanation of white matter as myelinated axons giving a whitish appearance.
Definition of a tract as a bundle of axons in the central nervous system.
Anatomy of white matter in the spinal cord, including dorsal, lateral, and ventral white columns.
The role of the anterior white commissure in the crossing of fibers.
The function of white matter in facilitating ascending (sensory) and descending (motor) information.
Description of the tract of Lissauer and its role in the pain and temperature pathway.
Importance of the somatotopic arrangement in the lateral corticospinal tract.
Overview of descending motor tracts in the lateral and ventral white columns.
Functions of the lateral corticospinal tract in voluntary control of skeletal muscles.
Role of the rubrospinal tract in stimulating limb flexors.
Ascending sensory tracts in the lateral white column, including the spinothalamic and spinocerebellar tracts.
The anterior spinothalamic tract's role in carrying crude touch and pressure sensations.
Ascending and descending tracts in the ventral white column, including reticulospinal and vestibulospinal tracts.
Functions of the medial and lateral reticulospinal tracts in supplying extensors and flexors.
Summary of the basic anatomy and function of the white matter of the spinal cord.
Transcripts
all right engineer so in this video
today we're going to talk about
the white matter of the spinal cord and
kind of a basic overview of the
ascending
and descending tracks let's go and get
started all right so when we talk about
the white matter of the spinal cord we
also
first have to talk about what in the
heck is white matter
that's important right so what is white
matter well let's take a teensy little
look here at the
kind of structure of a neuron you guys
know that on the neuron we're going to
have these little extensions called
dendrites right and then we know that
these dendrites are basically
you know the kind of the receptive
region of the neuron then you're going
to have this big structure here with the
nucleus which is called our cell
body and then here we're going to have
the axon
terminal or the terminal bulb whichever
you prefer
and then obviously the length of this
structure here from this point here to
this point here
is our axon the last thing that i want
you guys to remember here is that you
have these little
lipid protein sheets that are
surrounding the axon insulating the axon
allowing for action potentials to be
carried quick down the axon
what are these structures these little
pink little
fat structures hanging on these things
is called your myelin sheaths
these are called your myelin sheaths
now what i want you to remember is
anywhere on a neuron that you see
myelin i want you to remember that is
going to give the neuron a whitish
appearance
so the myelin sheath gives off a white
matter appearance right so when we talk
about white matter i want you to
primarily remember that it is the
myelinated
axons what is white matter it is the
myelinated
axons done
all right so we know what white matter
is the next thing we have to talk about
is another term that i'm going to be
using throughout the course of this
video and that is attract
now if you guys remember what a tract is
imagine here we have a bunch of cell
bodies
okay and then all of these cell bodies
they start giving off their axons and
these axons
travel up as a bundle
these bundles of axons right here this
whole thing here
that is called a track so what is
attract a tract
is a bundle of axons but primarily
in the central nervous system so it is a
bundle
of axons in
the central nervous system boom that's
what i want you to know
all right so we know white matter is we
know what attract is
now let's go over the basic anatomy of
the white matter in the spinal cord
so you know we have different parts of
the spinal cord right and we have we
know here's our gray matter
we've already talked about that well now
we have these columns here that we have
to talk about the white columns or the
funiculi
we already know that we talk about the
white columns based upon their position
in respect to the gray matter so here is
this white column it is
posterior or dorsal to this gray matter
so this is called or dorsal
white column right
or another term is our dorsal funiculus
this right here is our lateral white
column and again
because it's on the side so these are
your lateral white columns and they are
on the sides
of the gray matter so this is called our
lateral
white column or our lateral funiculus
boom all right last one is we have our
ventral
white column and the ventral white
column is anterior
to the gray matter so this is our
anterior
white column beautiful
sometimes there is another structure
that can come up
and you can see this in books and they
kind of sometimes represent it like this
they show these lines crossing there is
a special name for that
we're going to write this down this
right here is called your anterior
white commissure because it's in the
anterior
horn i mean the anterior white column
but this is where crossing of fibers
occur
so whenever fibers come into the dorsal
gray horn and they cross over to the
other side
that is what that structure is so what
is this structure here
it's kind of again in the ventral white
column anterior white column they kind
of represent it with little cross lines
this is called our anterior white
commissure beautiful
all right so we talked about the basic
anatomy of
our white matter the next thing that we
have to talk about
is that this white matter allows for
information
right to either move up so if the
information is moving
up right so let's say that we have
information moving up
right the information that's moving up
through these columns is called
ascending tracks or sending information
and this is usually
sensory information right sensory
information
the other one that we're going to have
to talk about that is also carried in
these white columns
is descending so it's descending
information
and descending information is usually
going to be
motor information so in these tracks
what i want you to remember is that
these tracks can
carry information via their axons up
as a part of your ascending tracks right
and they can carry information down
via the descending tracks that is what i
want you guys to know
okay and what we're gonna do is we're
gonna talk about some of these ascending
and descending tracks
in a basic overview way we have another
we have other videos on our
neurology playlist that cover all of
these tracks in great detail
we're gonna cover this basic all right
so the first kind of white matter track
that we have to talk
about here is actually an interesting
one because it kind of has an ascending
and a descending type of function
this is called the tract
of lasauer
the track of last hour is interesting so
what i want you to remember for the
tractively sour is it is involved in the
pain and temperature pathway
but what it allows for is let me explain
it through kind of a visual here
let's say i have three segments of the
spinal cord right so let's say that here
we have
let's say that this is the t1 segment
this is the
t2 segment and this is our t3 segment of
the
spinal cord now what happens is let's
say that we have a
pain and temperature stimulus so here
we're going to have a receptor right
and it's going to be picking up pain and
temperature sensations
when this receptor picks up that pain
and temperature sensation it carries it
via the sensory neuron
and generally we know that it goes into
the posterior gray horn well actually
that's not completely true
what happens is is this neuron will go
into the right before the posterior gray
horn
right let's imagine here i cut it off
so imagine i cut that portion off right
there
what happens is just before they enter
into that poster gray horn
they enter into this tract and what this
attracts
allows for is it allows for these pain
and temperature fibers
to ascend up one
or two spinal cord segments so you see
how there was a pain and temperature
sensation that were coming from the t3
spinal cord level
it actually won't synapse onto the
posterior gray horn
until it ascends one to two levels then
it'll synapse on the cell bodies here in
the posterior gray horn
cross over and then ascend upwards via
the
spinothalamic tract why is that
important
because if you develop a lesion in the
spinal thalamic tract
let's say at t1 level technically the
loss of pain
in temperatures and stations isn't from
t1 down
it's actually from two levels below
where that lesion is t3 and down
that's why it's important so what i want
you to know about the tractively sour
it allows for pain and temperature
fibers to
ascend or
descend one to two
segments okay before synapsing on the
cell bodies in the posterior gray horn
okay so now we understand the
attractiveness hour let's now move on
and talking about all the different
columns white columns
of dorsal lateral and ventral white
columns all right so we've talked about
white matter we've talked about what
that means to have white matter
or what it means to be white matter we
talked about axons that are bundle of
them in the central nervous system being
attract
right we talked about the anatomy of the
different columns right the dorsal white
column lateral white column
ventral white or another name is
funiculus right so dorsal finiculus
lateral funiculus ventral funiculus
we talked about the basic concept of
descending tracts which is descending
motor information
ascending tracks which is a sensory
information and we talked about this
first kind of weird track called the
tract of lasaur
now what i want to do is i want to take
a cross-section of the spinal cord here
right so i'm taking a cross-section of
the spinal cord
and what i want to do is i want to kind
of draw an imaginary line here
right down the middle of the spinal cord
on one half for kind of diagrammatic
simplicity sake
we're going to talk about all the
descending motor tracks
that are in the spinal cord that are
part of that white matter
and over here on the right side we're
going to talk about all the
ascending or sensory tracks that are
involved
in the white matter of the spinal cord
all right so first things first let's
kind of label these structures
the first one that is out of all of
these motor tracks the most important
is this one right here this big son of a
gun right here this guy right here
is called and it's in the lateral white
column so here we're going to make a
line here to kind of separate
right here is going to separate your
lateral white column from your ventral
white column or anterior white column
so in the lateral white column there's
only two descending
motor tracks what are those two
descending motor tracks
the real big one that i want you to know
is this one and this one is called
the lateral corticospinal
tract okay i want you to remember this
one this is the most important
descending tract in the lateral white
column the
other tract descending track that's also
present in the lateral white column
is called the rubra spinal tract it's
called the rubrow
spinal tract all right beautiful
that covers the descending motor tracks
that are present in the lateral white
column
now let's talk about the descending
motor tracks present in the ventral
white column
okay these ones are actually very
interesting here
so let's cover this from kind of lateral
inwards right
so this first one here this first one
here is called the
lateral reticulo
spinal tract the lateral reticulospinal
tract then if we move
here this is also a reticular spinal
tract but this one's lateral
this one's medial so this guy is called
the
medial reticulo
spinal tract beautiful
okay so we get the lateral reticular
spinal tract the medial reticulospinal
tract
there's another tract right here this
one which is very ventral but again a
little bit more laterally out in this
ventral white column this one is called
your
vestibulo vestibulo
spinal tract
then we move here again a little bit
more immediately we got this son of a
gun right here this is called our
tacto spinal tract
and then the last descending motor track
present in the anterior or ventral white
column
is called our anterior
corticospinal
tract all right beautiful so to recap
descending motor tracks which are
present only in the anterior white
column
are lateral reticular spinal tract
medial reticulospinal tract
vestibulospinal tract tactospinal tract
anterior corticospinal tract and the
lateral white column the descending
motor tracks are the
lateral corticospinal tract and the
rubro
spinal tract all right so the last thing
i want to talk about before we go
starting i'm talking about the basic
overview of the ascending tracks
right make up the white matter of the
spinal cord i want to basically cover
something that's very important
which is called somatotopic
kind of arrangement okay of
this lateral corticospinal tract we
actually have to know this for three
tracks total
the lateral corticospinal the dorsal
column medial meniscus pathway
and the lateral spinal thalamic tract
for right now i want to start with this
lateral corticospinal tract
what i want you to know in simple
way is that in the lateral corticospinal
tract
the legs are laterally that's all i want
you to know
so if we were to kind of put this like
this technically sacral
since the sacral motor supply would be
all the way laterally
then the lumbar then the thoracic
then the cervical if we were to kind of
slice these out like this
this is actually what i want you to know
so whenever we talk about the
somatotopic
arrangement of the lateral corticospinal
tract the descending motor neurons in
the cervical portion are most medially
the descending motor nuts and the
thoracic are just out laterally to that
the lumbar just laterally to that sacral
just laterally to that
why is that important if you develop a
lesion
that only affects this portion of the
lateral corticospinal tract
what areas of the body are going to get
less motor supply or no motor supply
the lower extremities because this is
the sacral and lumbar supply
if you develop a lesion that affects the
medial aspect of the corticospinal tract
the lateral
then you're going to have no motor
supply to the cervical
thoracic regions so now your upper
extremities and trunk
are going to be affected okay that's why
i want you to know that
okay so now we know the descending motor
tracks that make up the white columns
the lateral ventral now let's talk about
the ascending tracts
that are going to be again a component
of the white matter of the spinal cord
all right so we talked about the
descending tracks right which make up
the white mount of the spinal cord now
let's talk about the ascending tracks
that make up the white matter of the
spinal cord so let's start here with our
dorsal column do you guys notice
something
there's no descending tracks in the
dorsal column that's important to
remember only ascending tracks are
present in the
dorsal white column so there are special
names
for these tracks which are present in
the dorsal
column or that dorsal white column if we
talk about
this track which is located more
medially this track which is located
more immediately
this is called the fasciculus
gracilis if we talk about
this tract which is located laterally
in this dorsal white column this is
called our fasciculus
cunietus
that's the first thing i want you to
know okay we're going to talk about
again
the somatotopic arrangement in just a
second let's move on talk about the
other tracks first
so in the dorsal column there's only the
fasciculus gracilis and the fasciculus
cuneinate as fasciculus crystallus
medially fasciculus cunatus
laterally now let's go into this lateral
white column and again we're
going to separate these put a line right
here
okay so this line here is separating the
lateral white column
from the ventral white column in the
lateral white column there's actually a
bunch of ascending tracts
sensory tracts right this one here
on the outer side here kind of in the
dorsal aspect of this lateral white
column
is called the dorsal spino
cerebellar tract so dorsal spinal
cerebellar
tract this tract here which is actually
located more ventrally in this lateral
white column
this is called the ventral
spino cerebellar
tract beautiful
okay now this tract here
is actually a very very important one
this tract right here
is actually going to be the lateral
spinothalamic
tract what is this one the lateral
spinophthalmic
tract beautiful
so we have dorsal spinous cerebellar
tract ventral spinous cerebellar tract
lateral spinothalamic tract one more
tract here which is in the lateral white
column
it's this one right here this son of a
gun here is called the
spino aloe very
tract okay so we have
all of these ascending tracks present in
our lateral white column dorsal spinal
cerebellar ventral spinal cerebellar
spinal olivery
and lateral spinal thalamic tract now
before we cover the somatotopic
arrangements of the lateral
spinothalamic tract
and the dorsal column we're going to
next talk about the ascending tract here
and the anterior white column so
there's only thank goodness only one
ascending track
present within the anterior white column
what is this thing called this is called
our anterior
spinothalamic
tract all right
beautiful now that we've covered that we
have to cover the somatotopic
organization
of the lateral spinothalamic tract and
that dorsal column so let's cover that
first
okay remember what we said for the
lateral corticospinal tract right we
said legs
laterally guess what the lateral
corticospinal tract
and the lateral spinothalamic tract both
legs are laterally
okay so what does that mean that means
that the sacral
sensory supply is going to be most
laterally the
lumbar sensations are going to be a
little bit laterally here
thoracic and then cervical okay
so lateral corticospinal tract and
lateral spinal thymic tract
legs laterally that's what i want you to
remember
okay to finish up with this somatotopic
arrangement
we have to come over here to that dorsal
column now the dorsal column we said has
two areas here right the fasciculus
gracilis
and the fasciculus cunatus i want you to
remember
that the fasciculus gracilis is taking
information
from your lower extremities think about
graceful legs
okay whereas the fasciculus cuniatus is
getting it from the upper
extremities so again if that's the case
then
lower extremities are actually going to
be in here first so we have
sacral then we have lumbar
then we have thoracic and then we have
cervical
so technically the fasciculus gracilis
is taking sensory information from the
lumbosacral area
and the fasciculus cunatus is taking
sensations from the cervical and
thoracic area
boom roasted we hit that let's move on
to the basic functions
of these structures all right so we
already have
detailed videos that cover all these
ascending and descending tracks that we
talked about over here in that
cross section of the spinal cord which
we were kind of pretending is at the
cervical level
what i want you to remember is that
the basic functions the basic functions
of what we're going to cover here if you
want more detail
go watch those videos okay in our
neurology playlist
but dorsal column to give a basic
function of this we have to go back and
talk about that fasciculus
fasciculus gracilis
and the fasciculus cunatus remember
these are picking up
what types of sensations do you guys
remember we've talked about this like a
million times
it's picking up fine touch so like
you're fine a discriminative touch
it's picking up vibrations it's picking
up
proprioception all of those sensations
are being carried
via a specific pathway called the dorsal
column medial lemniscus pathway right
we have a video in more detail on that
what i want you to remember is that all
that fine discriminative touch
vibrations proprioceptions carried from
the fasciculus gracilis
is from t6 and below
whereas all the fine touch vibrations
proprioception discriminative touch
from the fasciculus cuniatus is going to
be from the t5 spinal cord level
and above that's all i want you to know
okay
lateral white column okay again dorsal
dorsal column just to recap
was there any motor pathways any
descending tracks no
only ascending tracks okay ladder white
column
there was motor tracks right we said
that the big one that i wanted you to
know was that
lateral corticospinal tract right so
that lateral
corticospinal tract what do we need to
know about this one
this will supply what again this is 85
of that corticospinal tract again it
decays at the pyramids right
but the main thing that i want you to
know is that this will
stimulate the lower motor neurons
right to allow for voluntary
control of
skeletal muscles that's all i want you
to know about this one again you want
more detail
on this go watch our video on that
lateral corticospinal tract
it stimulates the lower motor neurons
and again that allows for voluntary
control of our skeletal muscles for
fine-tuned type of activities
the other motor track that was present
within our lateral white column you guys
remember
it was the rubra spinal tract that was
our rubra
spinal tract now the rubra spinal tract
its basic function is it is also going
to stimulate lower motor neurons
but primarily for the flexors
okay so it's only going to pretty much
stimulate your
limb flexors that was all of the
descending tracts in the lateral white
column what were some of the ascending
tracts in the lateral white column do
you guys remember
one of them was the dorsal
spinocerebellar tract spino cerebellar
tract now the dorsal spinal cerebellar
tract what did it pick up
it picked up proprioception again for
like the
millionth time what is proprioception it
is the
three-dimensional position of our our
muscles right our tendons
our ligaments our joint capsules all
that stuff in a three-dimensional space
it sends that and picks up
proprioceptive sensations
from what areas of the body from c8 to
l2 via clark's column what was the other
white matter track there
the other one was called the ventral
spino
cerebellar tract and that was
also picking up what proprioceptive
sensations
and that proprioceptive sensations were
coming from what areas of the body
this was coming from from l2 to
the coccygeal one area of the spinal
cord
what was another white matter tract that
was called the
spino aloe very tract
and the spinal olivery tract was
important for what again it picks up
proprioception
but it sends this information to who
what structure
the inferior olives so it sends it again
to the inferior
olives and then the inferior olives will
send this to your
cerebellum these are called your
climbing fibers
okay the last one which we talked about
was the
lateral spinothalamic
tract and the lateral spinothalamic
tract we said that this one is going to
carry what kinds of sensations
primarily pain and
temperature sensations beautiful
all right so last one venture white
column we had all those
tons of motor tracks present right we
had what which ones did we talk about
first we said we had that lateral
reticulospinal oh what is another name i
should have said this before
what is another name for the lateral
reticulospinal tract
because remember there was two
reticulospinal tracts one's from the
pons
and then one's from the medulla lateral
medulla
okay so technically this is actually the
fibers coming from the
medulla so the medullary reticulospinal
tract
this one from medullo reticulospinal
tract is primarily for
flexors so all i want you to know is
that this stimulates
flexors done the other one we said was
the
medial reticulo
spinal tract oh
so what's the other one then this one
was the medulla the other one was the
pontine reticulospinal tract
so the medial reticular spinal tract is
also called the
pontine reticulospinal tract
this primarily supplies extensors
that's all i want you to know the other
one that we talked about is called the
vestibulo spinal vestibulo
spinal tract and the vestibulospinal
tract i want you to know that this one
is primarily stimulating
extensors your anti-gravity muscles
right the other one there's so many of
these dang things
the tectospinal tract the tectospinal
tract
i want you to know that that is going to
be sending information for
movement of the head and
neck and eye movements
boom roasted all right the last one here
is your ventral or anterior
corticospinal
tract right so it's the same thing
anterior ventral corticospinal tract
that was also going to stimulate lower
motor neurons
for voluntary
voluntary muscle control what type of
muscle
skeletal muscle control boom
that covered all of the descending
tracks there was
one sensory tract in this one it was the
interior spinothalamic
tract and this one carried crude
touch and pressure
sensations boom roasted
we hit all of them so now we know the
basic anatomy and the basic function of
the white matter of the spinal cord
all right ninja nurse so in this video
we talk in pretty decent detail about
the white matter of the spinal cord
its structure and its function i hope
this made sense hope you guys did like
it if you guys did
hit that like button comment down in the
comment section and please subscribe
alright ninja nerds we love you we thank
you we appreciate you and as always
until next time
[Music]
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