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Let’s continue our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.
Play USMLE Audio MP3 02 15 Anatomy Trigeminal Nerve Below
Begin 02 15 Anatomy Trigeminal Nerve Transcription
CN V, involved in four ways in a minor way with taste and then a major way with texture or mouth feel of the food, salivation, and muscles of mastication.
Which division and branch of CN V, the trigeminal nerve, is involved with texture on the tongue?
- The mandibular division of the trigeminal nerve and the branch is the lingual nerve.
And the lingual nerve is supplying what area of the tongue for texture sensation?
- The anterior 2/3 of the tongue.
And what division and branch of CN V gathers sensation from the mucosa of the inner cheek?
- The mandibular division of CN V, trigeminal nerve, and the buccal branch.
Alright, we’re not going to spend much time how CN V gathers taste except to ask, what 3 areas of the oral cavity does CN V gather taste from?
- Hard palate, soft palate for the mouth.
Now does CN V, the trigeminal, affect the salivary glands directly?
- No, it does not. It merely serves as a conduit to carry nerve fibers from toher sources to the salivary glands.
What are the 3 major salivary glands?
- The parotid, sublingual, and submandibular.
Ok, what type of innervation causes the salivary glands to release saliva?Sympathetic or parasympathetic?
Which of the cranial nerves actually supplies the parasympathetic fibers which innervate the parotid gland?
- CN XI.
The other name for CN XI?
- Glossopharyngeal nerve.
Which division and branch of the trigeminal nerve carries the parasympathetic fibers from cranial nerve XI, the glossopharyngeal to the parotid gland?
- The mandibular division of CN V and the branch is the auriculotemporal nerve.
And what is the name of the ganglion where the parasympathetic fibers from CN XI synapse before sending postsynaptic fibers to the parotid gland along the auriculotemporal nerve branch of the trigeminal?
- The otic ganglion.
And where is this otic ganglion?
- It hangs on the side of the mandibular division of the trigeminal before the auriculotemporal nerve branches off from it.
What type of nervous innervations tells the salivary glands to shut down and not put out saliva?
- The sympathetic.
And how do the sympathetic fibers get to the parotid gland?
- Along the external carotid artery which goes right through the middle of the parotid gland.
Now these sympathetic fibers to the parotid gland come of course from the sympathetic chain ganglia in the thorax, but where is the actual ganglion where they synapse to send the postganglionic sympathetic fibers to the parotid via the external carotid artery?
- The superior cervical sympathetic ganglion.
And where is the superior cervical sympathetic ganglion attached?
- To the side of the internal carotid artery.
****END OF TRANSCRIPTION****
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