Body Movement Terms Anatomy | Body Planes of Motion | Synovial Joint Movement Terminology
Summary
TLDRIn this anatomy lesson, Ben from registerednessrn.com covers essential body movement terms at synovial joints, crucial for healthcare professionals. The video discusses four major movement categories: gliding, angular (flexion/extension, abduction/adduction), rotational, and special movements. Examples include wrist and ankle movements, shoulder and hip rotations, and unique thumb actions like opposition and reposition. These terms are vital for patient assessment and documentation in medical fields.
Takeaways
- π There are four major categories of movements at synovial joints: gliding, angular, rotational, and special movements.
- π Gliding movements occur when bones move over each other in a linear direction without significant rotation, like waving your hand side to side.
- πΊ Angular movements include flexion and extension, which decrease or increase the angle between two structures, respectively.
- π€² Rotational movements involve bones moving around a central axis, like the head turning from side to side.
- π€ΈββοΈ Special movements are unique and don't fit into other categories, such as supination and pronation of the forearm and dorsiflexion and plantar flexion of the foot.
- π Abduction and adduction are angular movements that occur in the frontal plane, moving structures away from or towards the body's midline.
- π Circumduction is a complex movement that combines flexion, abduction, extension, and adduction to create a circular motion.
- π£ Inversion and eversion are special movements that turn the sole of the foot toward or away from the body's midline.
- 𦴠Hyperextension refers to movements that exceed the normal range of motion for a joint, sometimes causing confusion in terminology.
- π€ Opposition and reposition are special movements of the thumb, allowing it to touch the tips of other fingers and then return to the original position.
Q & A
What are the four major categories of movements that can occur at synovial joints?
-The four major categories of movements at synovial joints are gliding movements, angular movements, rotational movements, and special movements.
What is gliding movement and where does it primarily occur?
-Gliding movement occurs when the surfaces of bones move over one another in a linear direction without significant rotary or angular movement. It primarily takes place in the carpels of the wrist and the tarsals of the foot.
Can you explain the difference between flexion and extension?
-Flexion decreases the angle between two structures as they bend or move closer together, while extension increases the angle as they straighten and move apart.
How does abduction differ from adduction?
-Abduction is the movement of a structure away from a midline reference point, whereas adduction occurs as the structure is moved back toward the midline reference point.
What is circumduction and how is it performed?
-Circumduction is an angular body movement that blends flexion, abduction, extension, and adduction to create a circular or conical movement. It is performed by combining these movements in a smooth sequence to form a cone or circle at a joint.
What is rotation in the context of body movements?
-Rotation is a body movement term that describes a bone moving around a central axis, similar to a screw turning to either the right or the left.
What are supination and pronation, and how do they relate to the forearm?
-Supination and pronation are special movements involving the rotation of the forearm. Supination is the rotation of the radial bone laterally (away from the body's midline), while pronation is the rotation medially (toward the body's midline).
Define dorsiflexion and plantar flexion in relation to the foot and ankle.
-Dorsiflexion is the movement where the back or upper side of the foot moves toward the shin, decreasing the angle between the foot and the leg. Plantar flexion is when the sole of the foot moves toward the calf, decreasing the angle and pointing the toes away from the body.
How do inversion and eversion of the foot differ?
-Inversion is when the bottom of the foot turns so that it faces toward the body's midline, while eversion is the opposite motion where the bottom of the foot turns away from the body's midline.
What are the special movements of the thumb called opposition and reposition?
-Opposition of the thumb is when the tip of the thumb meets and opposes the tip of another finger from the same hand. Reposition is the return of the thumb and finger to their original position after opposition.
Outlines
π Overview of Synovial Joint Movements
Ben from registerednessrn.com introduces an anatomy lesson focusing on major body movement terms associated with synovial joints. He outlines four main categories of movements: gliding, angular, rotational, and special movements. Gliding movements are explained as linear bone surface movements without significant rotation, exemplified by waving the hand. Key joints where gliding occurs include the carpels of the wrist and the tarsals of the foot, as well as other plane joints like the sacroiliac joint and the acromioclavicular joint. Ben also covers angular movements, starting with flexion and extension, which involve decreasing and increasing the angle between two structures, respectively. Examples include elbow flexion and extension, shoulder and wrist movements, and even finger and thumb movements, all of which are crucial for healthcare professionals to understand when documenting or assessing patients.
πͺ Angular Movements: Flexion, Extension, and Hyperextension
The paragraph delves deeper into angular movements, particularly flexion and extension, which occur in the sagittal plane. Flexion decreases the angle between body parts, as seen in actions like bending the elbow, while extension increases it, as in straightening the arm. Ben also discusses hyperextension, where a body part moves beyond the normal anatomical position. He notes the variability in defining hyperextension among anatomists but advises students to follow their professor's definition for academic purposes. The paragraph also introduces lateral flexion and extension of the vertebral column, emphasizing the importance of understanding these movements for healthcare documentation and patient assessment.
πΆββοΈ Abduction and Adduction: Movements in the Frontal Plane
This section explains abduction and adduction, which primarily occur in the frontal or coronal plane. Abduction is the movement away from the body's midline, akin to someone being 'taken away', while adduction brings the structure back toward the midline. Examples include arm abduction and adduction, finger movements, and even wrist actions described as radial and ulnar deviation. The thumb, having a different orientation, performs abduction and adduction within the sagittal plane. Ben also discusses the abduction and adduction of the lower limbs, toes, and provides a clear demonstration of circumduction, a complex movement blending flexion, abduction, extension, and adduction to form a circular motion. The mnemonic 'FABlA' is introduced to help remember the order of movements in circumduction.
π Rotation and Special Movements of the Body
The focus shifts to rotation, a movement where a bone turns around a central axis, likened to a screw turning. Rotation occurs in the head, vertebral column, and ball and socket joints of the limbs. Ben illustrates how the head and trunk can rotate laterally and return to the anatomical position through medial rotation. He also details the external and internal rotations of the shoulder and hip joints. Special movements like supination and pronation of the forearm, which involve the radius rotating around the ulna, are explained. Supination turns the palm anteriorly, while pronation turns it posteriorly. A mnemonic is provided to remember these movements: 'Pronate to pick up produce, supinate to eat it for supper.'
π£ Special Movements of the Foot, Ankle, and Mandible
The final paragraph covers special movements like dorsiflexion and plantar flexion of the foot and ankle, which involve the upper and lower side of the foot moving towards the shin or calf, respectively. Inversion and eversion are movements that turn the sole of the foot toward or away from the body's midline. Elevation and depression describe upward and downward movements, commonly associated with the mandible and scapulae. Protraction and retraction involve the scapulae moving forward or backward, while protrusion and retrusion describe the anterior and posterior movement of the mandible. Excursion is the side-to-side movement of the mandible. Opposition and reposition of the thumb are also discussed, highlighting the thumb's unique ability to touch the tips of other fingers due to the saddle joint at the thumb's base. The video concludes with an invitation to take a quiz on the website and explore more anatomy videos.
Mindmap
Keywords
π‘Synovial Joints
π‘Gliding Movements
π‘Angular Movements
π‘Rotational Movements
π‘Special Movements
π‘Flexion
π‘Extension
π‘Abduction
π‘Adduction
π‘Circumduction
Highlights
Introduction to major body movement terms at synovial joints
Definition and example of gliding movement
Examples of joints that allow gliding movement
Explanation of angular movements: flexion and extension
Demonstration of elbow and shoulder flexion and extension
Flexion and extension of the wrist, fingers, and thumb
Hip and knee flexion and extension movements
Flexion and extension of the vertebral column and neck
Clarification on hyperextension and its definitions
Abduction and adduction movements in the frontal plane
Examples of arm, finger, and wrist abduction and adduction
Abduction and adduction of the thigh and toes
Introduction to circumduction and its definition
Demonstration of shoulder circumduction
Mnemonic 'FAbia' for remembering circumduction movements
Definition and examples of rotation movement
Special movements: supination and pronation of the forearm
Mnemonic for remembering supination and pronation
Special movements: dorsiflexion and plantar flexion of the foot
Special movements: inversion and eversion of the foot
Special movements: elevation and depression of the mandible and scapulae
Special movements: protraction and retraction of the scapulae
Special movements: protrusion, retrusion, and excursion of the mandible
Special movements: opposition and reposition of the thumb
Conclusion and invitation to take a comprehensive quiz on the website
Transcripts
hey everyone this is ben with
registerednessrn.com and in this anatomy
lesson
i'm going to cover all the major body
movement terms that can occur at the
synovial joints
and if you happen to go into a
healthcare profession you'll probably be
using some of these terms during
documentation
or assessing your patients and so on
there are four
major categories of movements that can
occur at the synovial joints
you have gliding movements angular
movements rotational movements
and special movements let's start with
gliding
so what is gliding gliding occurs when
the surfaces of bones
move over one another in a linear
direction
without significant rotary or angular
movement
the most common example of gliding is
just simply taking your hand
and moving it from left to right in a
waving motion like this
and that can help you remember that the
gliding joint movements primarily take
place in the carpels of the wrist
and the tarsals of the foot however
gliding can also occur
in the other plane joints of the body
and a simple way to remember which
joints allow gliding
a plane joint think of airplane gliding
through the air
so the plane joints are going to allow
gliding and some examples of joints that
do this are the sacroiliac joint of the
pelvis
the acromioclavicular joint of the
shoulder the femoral patellar joint
the tibiofibular joint the vertebral
costal and sternocostal joints of the
ribs
as well as the intervertebral joints of
the spine
now let's talk about the angular
movements and i'll begin with
flexion and extension and i find
personally that it really helps to think
in terms of angles because
flexion is going to decrease the angle
between two structures
as they bend or move closer together
whereas extension is going to
increase the angle between those
structures as they straighten and move
apart
so let's take a look at some examples of
flexion and extension
elbow flexion also called forearm
flexion
occurs when the angle between the
forearm and arm
decreases allowing the ulna of the
forearm to move closer
to the humerus bone of the arm in
contrast elbow extension
also called forearm extension occurs
when the forearm moves away from the arm
increasing the angle between those bones
shoulder flexion
also called arm flexion occurs when the
angle between the humerus of the arm
and the scapula decreases in contrast
shoulder extension also known as arm
extension
occurs when the angle between the
humerus of the arm and the scapula
increases causing the arm to move
posteriorly
and the joint here allows posterior
movement past the anatomical position
flexion of the wrist also called hand
flexion
occurs when the angle between the palm
of the hand and the anterior surface of
the forearm
decreases while extension of the wrist
or hand extension
is moving the palm of the hand away from
the anterior surface of the forearm
hence the angle increases as it
continues to move beyond the anatomical
position finger flexion occurs when the
angle between the anterior surface of
the fingers
and the palm decreases and when the
angle between the fingers and the palm
increases finger extension occurs
flexion and extension can also occur
within the
interphalangeal joints now as you can
tell up to this point
most of the movements with flexion and
extension are going to occur
within that sagittal plane or parallel
to the sagittal plane
however with the thumb it's a little bit
different thumb flexion is going to have
the thumb moving toward the pinky
kind of parallel to the palm within that
frontal plane and some
extension is going to have the thumb
moving away from the pinky and if you
think of your palm as a windshield
and your thumb is a windshield wiper
it's going to kind of go back and forth
in that kind of a motion
flexion and extension can also occur at
the interphalangeal joint of the thumb
next we have hip flexion also called
thigh flexion
which occurs when the angle between the
femur of the thigh
and the hip bone decreases as the thigh
moves anteriorly or forward
hip extension or thigh extension occurs
when the angle between the femur and the
hip bone
increases as the hip joint straightens
and just like the shoulder joint this
joint also allows movement past the
anatomical position
knee flexion also called leg flexion
occurs when the tibia bone moves
toward the femur causing the angle to
decrease between those two structures
knee extension or you could say leg
extension occurs as the angle between
those leg bones
increases causing the leg to straighten
and just like the fingers
toe flexion and extension can also occur
vertebral column flexion
or spine flexion occurs when the angle
between the trunk
and the hip joint decreases and spine
extension occurs as the spine
straightens
neck flexion occurs as the angle between
the head and the trunk of the body
decreases
whereas neck extension occurs as the
head moves away from the trunk of the
body
and the neck is another one of those
structures that can continue posteriorly
beyond the anatomical position
the vertebral column can also experience
flexion within that frontal plane
for example if you bend the spine to the
left or to the right
that's called lateral flexion and
movement
back toward the anatomical position is
called
lateral extension and then finally i
want to talk a little bit about
hyperextension because whenever a
structure moves beyond a certain point
anatomist will refer to that as hyper
extension
now what can get a little tricky with
this is that anatomist will sometimes
define hyperextension differently
for example some anatomists will say
that when the arm neck
wrist or leg moves past the normal
anatomical position in a posterior
motion
it actually becomes hyperextension and
not just extension
whereas other anatomists will only
consider these movements hyperextension
if the movement exceeds the normal range
of motion permitted by that joint
obviously for test taking purposes
you'll want to do whatever your anatomy
professor says
but i just wanted to give you a heads up
about that now unlike flexion and
extension body movements which mostly
take place within the sagittal plane or
parallel to the sagittal plane
abduction and adduction movements are
mostly going to take place within the
frontal or
coronal plane however the thumb is one
exception and i'll demonstrate abduction
and adduction of thumb
later in this video so what is abduction
abduction is the movement of a structure
away from a midline reference point
and let the name help you out what does
abduct mean
when you hear on the news that a man was
abducted you know it means that someone
took them away
and that's exactly what's going on with
this movement the structure is being
moved away from the midline
reference point now what is adduction
adduction occurs as the structure is
added back toward the midline reference
point
so let's take a look at some examples of
abduction and
adduction on the body during arm
abduction
the arms move away from the body's
midline during arm
adduction you add them right back toward
the midline
finger abduction occurs when the fingers
move away from the midline of the hand
whereas finger adduction occurs when you
add them back toward the hand's midline
when the middle finger which serves as
the midline point of the hand
deviates away from the body in the
anatomical position
it's called lateral abduction and when
it deviates toward the body
it's considered medial abduction and as
i mentioned earlier the thumb is going
to operate a little bit differently
because it has a different orientation
than the other fingers
abduction of the thumb has it moving
within the sagittal plane in an anterior
motion
and adduction of the thumb has it added
back to the hand
when determining abduction and adduction
of the wrist
i find that it helps to stand in the
anatomical position
abduction of the wrist has it moving
away from the body's midline
in the same direction as arm abduction
adduction of the wrist has it going in
the opposite direction
toward the body's midline these
movements are also referred to as radial
deviation
and ulnar deviation remember the radius
is on the thumb side which is where you
check the radial pulse
so radial deviation is the movement
toward the radial side
and ulnar deviation is toward the other
side during thigh
abduction the lower limb moves away from
the body's midline
and during adduction of the thigh you
add the lower limb
right back toward the body's midline
when the toes move away from the midline
of the foot
and spread apart abduction occurs and
adduction of the toes adds them right
back together
and just like with the hand the foot is
also going to have its own midline
reference point which is the second
toe and whenever that second toe
deviates
away from the body's overall midline
then that's called lateral abduction
and whenever the second toe moves toward
the body's midline then that's called
medial abduction
and finally i'll demonstrate
circumduction which is an angular
body movement term that blends the
motions of flexion
abduction extension and adduction to
create a circular or
conical movement now the word
circumduction starts with the exact same
letters as the word
circle so that will tip you off that
this movement is going to create that
circular or conical movement at a joint
because circumduction utilizes four
different movements i like to do it in
slow motion so i can see how those four
movements combine to create that
circular effect
looking at the shoulder joint i'll begin
with arm flexion
then arm abduction next is arm extension
followed by arm adduction and when you
combine those movements into a smooth
motion you can see how it forms a cone
or circle this sort of feels like it
could be the next big dance move
[Music]
and if you have trouble remembering the
specific order of these movements you
can remember the mnemonic
fabia which stands for flexion abduction
extension and adduction now you can also
reverse that order and do it the other
way
however the movements are going to have
to alternate in a similar succession
in order to create that circular motion
now where does circumduction occur on
the body
well generally speaking it requires that
flexion
abduction extension and adduction so
it's going to occur at the joints of the
body that allow those specific movements
circumduction can occur at the hip joint
or thigh circumduction can occur at the
shoulder joint or
arm circumduction of the wrist or hand
can also occur
circumduction of the thumb can occur
circumduction of the fingers
circumduction of the ankle or foot you
have circumduction of the toes
and circumduction of the head now let's
talk about rotation
what is rotation rotation is a body
movement term that describes a bone
moving around a central
axis when i think of the rotation body
movement i like to picture a screw
turning to either the right or the left
as that is basically the same kind of
motion
that can occur in the body with this
movement rotation can occur at the head
vertebral column and the ball and socket
joints of the upper and lower limbs
so let's take a look at some of these
movements the head can rotate
laterally to either the left side or the
right side
thanks to a pivot joint between
vertebrae c1
and c2 now returning the head toward the
anatomical position
is going to be medial rotation of the
head the vertebral column can also
rotate
laterally to either the left or the
right
and returning the trunk toward the
anatomical position
is medial rotation of the trunk you spin
me right round baby right round
the ball and socket joint of the
shoulder allows the humerus of the arm
to rotate
laterally or away from the body's
midline
which is also called external rotation
it can also rotate medially or toward
the body's midline
which is also called internal rotation
the ball and socket joint of the hip
allows rotation of the thigh's femur
and just like with the humerus it can
rotate laterally or
away from the body's midline which is
also called external rotation
and it can also rotate medially or
toward the body's midline
creating an internal rotational movement
and one thing that you want to keep in
mind is whenever you're looking at the
rotation of the arm or the thigh
you're going to want to focus in on the
anterior surface of it
so the front of the arm or the front of
the thigh keep that as your focal point
and if it's moving toward the body's
midline you know it's going to be medial
rotation of those structures
or internal rotation and if it's moving
away from that you know it's
lateral or external rotation and finally
we have the last category of body
movement terms that don't fit into any
of the other categories
so these are called the special
movements first let's talk about
supination and pronation which are
special movements involving rotation
of the forearm your forearm consists of
two bones you have the
radius which is on the lateral side of
the forearm in the anatomical position
and you also have the ulna which is on
the medial side in the anatomical
position
during supination the distal end of
the radial bone is going to rotate
around the ulna
in a lateral direction now lateral
rotation is
away from the body's midline so this
motion is going to look like this
and i like to pay attention to the
thumbs because the thumb is on the same
side as the radius
hence when you check a radial pulse
you're checking
just below the thumb right here so when
you look at the thumbs and if you
imagine there's a midline going down my
body
like kind of in line with my necktie
watch the thumbs and as it's rotating
away
from the midline of the body this is
supination
in contrast pronation is the opposite
movement here
we're going to see the distal end of the
radial bone rotate over the ulna in a
medial direction
so medial means towards the midline of
the body so now we're going to see those
thumbs point
towards the body's midline some people
also like to look at the
orientation of the palms of the hand to
help them determine whether
supination or pronation is occurring so
if i put my arms down like this and you
look at the palms of my hands
supination is going to result in that
lateral rotation of the radial bone
which is going to
leave your palms facing forward or
anteriorly
and this might look familiar because
this is exactly
their orientation in the anatomical
position however if my elbow were flexed
about 90 degrees
now what's happened the palms are facing
up in contrast pronation is going to
have the palms facing the opposite
direction they are going to face
posteriorly or toward the back in the
anatomical position
or if my elbow reflects about 90 degrees
then pronation is going to have the
palms facing
down or inferiorly now let me give you a
really simple mnemonic to help you
remember these two movements
you see this girl right here at the
store she has to pronate
to pick up her produce so you have to
pronate to pick up your produce
and when you want to eat it for supper
you supinate and bring it to your mouth
or if you want to take a multivitamin
you have to pronate to poor
and you have to supinate to catch the
supplement next we have dorsiflexion
and plantar flexion which are special
movements involving the foot
and ankle joint now to help you
understand this movement let's break
down the words
dorsal refers to the back or upper side
of something
in my video on directional terms i use
the example of a dorsal fin of a dolphin
to help me remember that dorsal refers
to the back side or upper side of a
surface
your toenails for example are on the
dorsal side of the foot
in contrast plantar refers to the sole
or bottom of the foot if you've ever had
a plantar wart then you've had a wart
right there on the sole of your foot
and then flexion in anatomy just refers
to a movement that decreases the angle
between
two surfaces now let's put those words
together and you will totally understand
this movement
during dorsiflexion the back or upper
side of the foot
moves toward the shin decreasing the
angle between these two surfaces
leaving the toes pointing a little bit
closer to the head and yes i know i have
tan lines on my feet
don't judge when you try to walk on your
heels only
you dorsiflex the foot and in nurse
sarah's preeclampsia and eclampsia
review
she used dorsiflexion to assess for
ankle clonus
during plantar flexion the sole of the
foot
moves toward the calf decreasing the
angle between
those two surfaces leaving the toes
pointing away from the body
when you perform calf raises in the gym
or walk on your tippy toes
you plantar flex the foot now let's talk
about inversion and eversion
which are special body movements that
turn the soul
either toward the body's midline or away
from the body's midline
during inversion the bottom of the foot
turns so that it faces toward the body's
midline
inversion starts with the word in so
that's the dead giveaway that the soul
is going to be pointing
inwardly or medially during eversion
the opposite motion occurs the bottom of
the foot turns so that faces away from
the body's midline
laterally the word evert literally means
to turn
outward which is exactly what happens
during
eversion now let's talk about elevation
and depression
elevation refers to the movement of a
body part in a superior
direction or moving upward whenever you
walk into a hotel lobby
you have to get on the elevator to go up
right and we'd also say that a mountain
has a really high peak elevation
therefore the term elevation is pretty
self-explanatory it has a structure
moving
up or superiorly in contrast depression
refers to the movement of a body part
going downward or in an inferior
direction
when you are depressed you feel down in
the dumps right
therefore it's easy to remember that
depression has a body part moving
downward or inferiorly in anatomy
elevation and depression most commonly
describe movement of the mandible
or the scapulae within the frontal plane
when you move your mandible in a
downward direction
depression occurs and when you move your
mandible upward
elevation occurs similarly when you move
your scapulae
up elevation of the shoulder girdle
occurs
and when you move them back down
depression of the shoulder
girdle occurs next we have protraction
and retraction which are special body
movements that involve the scapulae
better known as your shoulder blades
protraction moves the scapula
forward or anteriorly and toward the
side of the body or laterally
in an anterolateral direction retraction
is the opposite movement
it's going to cause the shoulder blades
to move back or posteriorly
and more toward the body's midline or
immediately
in a movement known as a postero medial
movement now here's a really simple way
to remember this movement
when you reach back you retract
and then you punch to protract in fact
the serratus anterior muscles
assist with this movement and they even
call this muscle the boxer's muscle for
this very reason
next we have protrusion retrusion
and excursion which are special body
movement terms that refer to motion
going
anteriorly posteriorly or side to
side protrusion refers to the movement
of a structure in an
anterior or forward direction in fact
the word protrude means
projecting something forward and i like
to call protrusion the
kissing movement because it occurs when
you
pucker your lips like you're going to
give someone a kiss or when you stick
out your tongue
or moving the mandible or lower jaw
forward
now retrusion is the opposite of
protrusion
it refers to movement going in a
posterior or
backward direction putting your tongue
back in your mouth
moving the lips back or moving the
mandible back
are all examples of retrusion in anatomy
now some anatomists will refer to that
forward and backward motion of the
mandible as protraction and retraction
just like i discussed with the shoulder
blades in my last video
however some prefer to use protraction
and retraction only when describing the
shoulder blades because
it's a combined movement for example
protraction is an
anterolateral movement whereas
protrusion and retrusion are more
anterior and posterior movements and
then finally we have
excursion which is a side to side
movement
of the mandible now some of you might
remember a character named ernest
p wuerl which is that guy and all those
movies from
earnest goes to camp ernest goes to jail
ernest saves christmas etc
and if you've ever seen one of those
movies then you have definitely seen the
excursion movement because
anytime earnest would see something
gross he would go
and that's basically all excursion is
it's the movement of the lower jaw which
is your mandible
in either a left or right direction and
anatomists use directional terms
to specify the type of excursion for
example
when the lower jaw moves to either the
left or the right
away from the midline of the body they
simply call that
lateral excursion and when the mandible
moves closer to the center of the body
it's called medial excursion now let me
demonstrate
opposition and reposition which are
special movements involving the thumb
now the thumb articulates or forms a
joint with the trapezium bone of the
wrist
via a saddle joint a type of synovial
joint
featuring interlocking convex and
concave
surfaces and they call it a saddle joint
because
well it looks like a saddle saddle up
cowboy yeehaw
now thanks to this saddle joint the
thumb can perform various movements such
as
circumduction flexion and extension
abduction and adduction as well
as special movements called opposition
and reposition opposition of the thumb
occurs when the tip of the thumb
comes to meet and oppose the tip of
another finger
from the same hand now a super simple
way to remember
this movement is that you've probably
heard someone say that humans have
opposable thumbs
and we do and that's what this movement
opposition is all about it's about
taking the thumb
and moving it around so that it opposes
each of the digits or fingers by
touching the tip like that
also check this out whenever opposition
occurs the thumb moves and
meets the tip of one of the fingers and
when you look at the shape that results
it kind of makes the shape of a letter
o o for opposition with our opposable
thumbs now reposition is super simple
because it is the
opposite action of opposition during
reposition
the thumb and finger return to their
original position
okay that wraps up this compilation
video over the major body movement terms
and you can take a comprehensive quiz on
our website for free just by clicking
the link in the description below
also we have a playlist with a whole
bunch of anatomy videos in that you
might want to check that out
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