Tongue - Nerve Supply
Summary
TLDRThis video explores the complex nerve innervation of the tongue, highlighting its diverse origins. The anterior 2/3 of the tongue is innervated by the lingual nerve for general sensation and chorda tympani for taste, except for the circumvallate papillae. The posterior 1/3 is served by the glossopharyngeal nerve for both sensations. The posteriormost part receives innervation from the internal lingual branch of the vagus nerve. The tongue's musculature, except for the palatoglossus muscle, is innervated by the hypoglossal nerve, with the palatoglossus being an exception due to its origin from the sixth branchial arch.
Takeaways
- 👅 The tongue has different nerve supplies depending on its parts: anterior 2/3, posterior 1/3, and the posterior most part.
- 🧠 The anterior 2/3 of the tongue's sensory supply is via the lingual nerve, a branch of the mandibular division of the trigeminal nerve (CN V).
- 🔟 The posterior 1/3 of the tongue's general sensation is carried by the glossopharyngeal nerve (CN IX).
- 🌐 The posterior most part of the tongue's general and taste sensations are served by the internal lingual branch of the vagus nerve (CN X).
- 👂 Taste sensation for the entire anterior 2/3 of the tongue is carried by the chorda tympani, a branch of the facial nerve (CN VII).
- 👅 The taste sensation for the circumvallate papilla and the posterior 1/3 of the tongue is handled by the glossopharyngeal nerve (CN IX).
- 💪 All muscles of the tongue, except for the palatoglossus, are innervated by the hypoglossal nerve (CN XII), which originates from the occipital myotomes.
- 🗣️ The palatoglossus muscle is an exception; it is innervated by the accessory nerve due to its origin from the mesenchyme of the sixth branchial arch.
- 🌱 The epithelium covering the anterior 2/3 of the tongue originates from the first branchial arch, while the posterior 1/3 comes from the third branchial arch, and the posterior most from the fourth branchial arch.
- 🧐 Understanding the embryological origins of different parts of the tongue helps in remembering their respective nerve supplies.
Q & A
What is the main reason why understanding nerve innervation to the tongue can be confusing?
-Understanding nerve innervation to the tongue can be confusing due to the fact that different parts of the tongue have different sources or origins.
What are the three main parts of the tongue mentioned in the script?
-The three main parts of the tongue are the body or anterior 2/3, the posterior 1/3, and the posterior most part.
Which branchial arch does the epithelium covering the anterior 2/3 of the tongue originate from?
-The epithelium covering the anterior 2/3 of the tongue originates from the first branchial arch.
What nerve is responsible for the general sensation of the anterior 2/3 of the tongue?
-The lingual nerve, which is a branch of the mandibular division of the trigeminal nerve (CN V), is responsible for the general sensation of the anterior 2/3 of the tongue.
Which cranial nerve provides general sensation to the posterior 1/3 of the tongue?
-The glossopharyngeal nerve (CN IX) provides general sensation to the posterior 1/3 of the tongue.
What nerve carries out general and taste sensations for the posterior most part of the tongue?
-The internal lingual branch of the vagus nerve (CN X) carries out both general and taste sensations for the posterior most part of the tongue.
Which nerve is responsible for taste sensation in the anterior 2/3 of the tongue, and what is an exception to this?
-The chorda tympani, a branch of the facial nerve (CN VII), is responsible for taste sensation in the anterior 2/3 of the tongue, except for the circumvallate papillae.
What type of muscles does the tongue have, and which cranial nerve innervates them?
-The tongue has intrinsic and extrinsic muscles, and all these muscles are innervated by the hypoglossal nerve (CN XII), except for the palatoglossus muscle.
Which muscle of the tongue has a different innervation compared to the others, and what is its innervation source?
-The palatoglossus muscle has a different innervation source compared to the other muscles of the tongue; it is innervated by the cranial part of the accessory nerve.
Why is the innervation of the tongue muscles primarily by the hypoglossal nerve?
-The muscles of the tongue have their origin from occipital myotomes, hence their innervation is chiefly by the hypoglossal nerve (CN XII).
How does understanding the origin of the tongue's parts help in remembering its innervation?
-Understanding the origin of the tongue's parts helps in remembering its innervation because the nerves that supply these parts correspond to the branchial arches from which the parts originate.
Outlines
👅 Nerve Innovations of the Tongue
This paragraph discusses the complexity of nerve supply to the tongue due to its different parts having distinct origins. The tongue is divided into anterior 2/3, posterior 1/3, and the posteriormost part. The anterior 2/3 has its epithelium from the first branchial arch and is supplied by the lingual nerve, a branch of the trigeminal nerve. The posterior 1/3 and the posteriormost part have their epithelium from the third and fourth branchial arches, respectively, and are innervated by the glossopharyngeal nerve (CN IX) and the internal laryngeal branch of the vagus nerve (CN X). Taste sensation for the anterior 2/3 is provided by the chorda tympani, a branch of the facial nerve, except for the circumvallate papillae. The musculature of the tongue, except for the palatoglossus muscle, is innervated by the hypoglossal nerve (CN XII), which originates from the occipital myotomes. The palatoglossus muscle is an exception, being innervated by the accessory nerve due to its origin from the sixth branchial arch.
📝 Summary of Tongue's Nerve Innovations
The second paragraph summarizes the nerve supply to the tongue. For the anterior 2/3, the lingual nerve provides general sensation and the chorda tympani provides taste sensation, except for the circumvallate papillae. The glossopharyngeal nerve (CN IX) innervates the general and taste sensations of the posterior 1/3 and the posteriormost part of the tongue, including the circumvallate papillae. The internal laryngeal branch of the vagus nerve (CN X) also supplies the posteriormost part. All muscles of the tongue, except for the palatoglossus, are innervated by the hypoglossal nerve (CN XII). The palatoglossus muscle is innervated by the cranial part of the accessory nerve due to its origin from the sixth branchial arch. Understanding the origin of the tongue's parts helps in remembering their respective nerve supply.
Mindmap
Keywords
💡Nerve Innovation
💡Tongue
💡Branchial Arches
💡Epithelium
💡Lingual Nerve
💡Glossopharyngeal Nerve
💡Vagus Nerve
💡Taste Sensations
💡Intrinsic and Extrinsic Muscles
💡Hypoglossal Nerve
💡Palatoglossus Muscle
Highlights
Different parts of the tongue have different sources or origins, which can be confusing.
The body or anterior 2/3 of the tongue is distinct from the posterior 1/3 and the posterior most part in terms of nerve supply.
The epithelium covering the anterior 2/3 of the tongue originates from the first branchial arch.
The posterior 1/3 of the tongue's epithelium has its origin from the third branchial arch.
The epithelium of the posterior most part of the tongue comes from the fourth branchial arch.
Each branchial arch has its own respective nerve, muscle, and blood vessel.
The sensory supply for the anterior 2/3 of the tongue is by the lingual nerve, a branch of the mandibular division of the trigeminal nerve.
The general sensation for the posterior 1/3 of the tongue is carried by the glossopharyngeal nerve, the ninth cranial nerve.
The general and taste sensations for the posterior most part of the tongue are carried by the internal lingual branch of the vagus nerve, the tenth cranial nerve.
Taste sensation for the entire anterior 2/3 of the tongue is carried by the chorda tympani, a branch of the facial nerve.
The circumvallate papillae are an exception, with taste sensation carried by the glossopharyngeal nerve.
The tongue is composed of intrinsic and extrinsic muscles, all innervated by the hypoglossal nerve, the twelfth cranial nerve.
Palatoglossus muscle is an exception, innervated by the accessory nerve due to its origin from the sixth branchial arch.
Understanding the origin of tongue parts helps in remembering their respective nerve innervations.
The nerve supply to the tongue is essential for both general and taste sensations.
The video provides a comprehensive overview of the tongue's nerve innervation, which is crucial for medical and dental professionals.
Transcripts
[Music]
[Laughter]
[Music]
hi in this video I'll be discussing
about nerve Innovation to tongue the
reason why this topic is bit confusing
in complex is because of the fact that
different parts of tongue have different
sources or origin so once we understand
or Trace out the origin of different
parts of tongue including its
musculature it will be easier for us to
remember or understand the nerve
Innovation to tongue so before going
into the details let's briefly look into
the parts of a tongue we have this body
or anterior 2/3 of tongue we have this
posterior 1/3 of tongue and the
posterior most part of the tongue the
epithelium covering the entire tongue
has different sources or origin the
epithelium covering the anterior 2/3 of
tongue has its origin from the first
branchial Arch whereas the epithelium
covering the posterior 1/3 has its
origin from the third bran Arch and the
epithelium covering the posterior most
has its origin from fourth bran
Arch so as we all know each bran Arch
has its own respective nerve has its own
respective muzzle has its own respective
blood vessel so depending upon the
origin of these parts of epithelium from
the respective bran arches we have
different Innovations so now let's
briefly look into the nerve innovation
of
tongue for the anterior 2/3 of tongue
sensory Supply is bil lingual
nerve so this lingual nve is a branch of
mandibular division of trial n and for
the posterior
1/3 that is for this area the general
sensation is carried out by glossop
ferial nerve which is a ninth cranial
nerve and for the poster most part of
the tongue the general sensation is
carried out by
internal lingal
branch of
Vegas which is a 10th cranial n so in
brief the general Sensations for the
anterior 2/3 is by the lingual n which
is a branch of trial n and for the
posterior 1/3 General sensation is by
glossop fenial nve and for the posterior
most part the general sensation is by
internal lenel branch of vas now now
coming to taste sensations we have an
exception here for the anterior 2/3 of
the tongue so for this entire area the T
sensation is carried out by Corda
tan so this Corda tempany is a branch of
facial no so in the anterior 2/3 tast
sensation is carried out by C impan any
except for this circum valent
papillo for the posterior one/ thir of
the tongue the test sensation is carried
out by the
same glossop ferial nerve including
circum valet papillar so for this
posterior 1/3 test sensation is carried
out by the same n which carries out
General Sensations that is gloss ofel no
including the circum valent
papilla and for the posteriormost part
of the town The Taste sensation as well
as the general Sensations are carried
out by the same internal lenial branch
of vas snow so these are in brief about
the general Sensations and taste
sensations of the entire tongue so apart
from this we have musculature as tongue
is a soft organ without any bones it is
made up of two types of muscles broadly
that is intrinsic musles as well as
extrinsic
muscles so all muscles of tongue are
inated by hypoglossal
nerve so the musles of tongue are
innervated by hypoglossal nerve that is
a 12th cranial nerve because these
muscles have their origin from occipital
myotomes so since the muzzles of tongue
have their origin from oxital my
their ination is chiefly by the hypogen
L however we have an exception here
except for one muzzle one extrinsic
muszle that is palatoglossus whose
inovation is mainly by
the accessory nve so palatoglossus no
has its Innovation from cranial part of
accessory no because it has its origin
from the mism of sixth banul
Arch so this is in brief the innovation
of the entire tongue to
summarize the epithelium of tongue has
its Innovations depending upon the part
it is located in for the anterior 2/3
the general sensation is by the lingual
nve that is the branch of mandibular
division of trial no whereas The Taste
sensation is by the cordan which is a
branch of facial no except for circum
valent papilla so this circum valent
papilla along with posterior 1/ thir of
tongue are innervated by glossop fenial
no or ninth cranial no and the posterior
most part of the tongue has its General
and taste sensations derived from
internal lingal branch of vas sow and
coming to the muscul all the muscles of
tongue have their origin from oxital
myotomes hence inovated by hypoglossal n
except for palatoglossus whose origin is
from the mism of six bran AR hence It Is
inovated by the cranial part of
accessory no so once you understand the
origin of any part of tongue it will be
easier for you to remember the
respective
Innovation so this is in brief about a
nerve Innovation to tongue
[Music]
[Laughter]
[Music]
oh
[Music]
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