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Glossopharyngeal Nerve Summary

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Dr. P here summarizing the 9th cranial nerve.

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We learned that there are three real origin components of

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the glossopharyngeal nerve

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at the level of the medulla oblongata.

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We've got the nucleus ambiguus,

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which is just posterior to the mid coronal plane,

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close to the midline.

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We've got the inferior salivary nucleus.

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And although I haven't divided them up

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into sensory and motor this time,

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we've also got a little more lateral to that,

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the nucleus of the solitary tract.

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And these three are going to contribute to both sensory

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and motor components of the glossopharyngeal nerve

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to create the apparent origin of the glossopharyngeal nerve,

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which travels very nicely with its companion,

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the vagus nerve, which I'll draw over in red right here.

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So then, these nerves go out to the side

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and we're going to come off now our drawing tool,

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and we're going to go down.

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And the nerve sits between the carotid artery and the

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jugular vein, traveling inferiorly as we discussed before.

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Now, the branches include tympanic, stylopharyngeal,

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and tonsillar.

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There's a nerve to the carotid sinus branches to the

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posterior third of the tongue which participate in taste.

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And these are known as lingual branches.

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There's also a communicating branch to the vagus nerve.

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It's important when you're taking any board exam that you

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remember the glossopharyngeal provides taste

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to the posterior third of the tongue.

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Taste to the anterior two-thirds of the tongue comes from

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the chorda tympani nerve, from the facial nerve,

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traveling with V3,

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the third division of the trigeminal nerve.

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The glossopharyngeal nerve also contributes in the

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formation of the pharyngeal plexus,

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along with the vagus nerve,

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and has motor supply to some of the constrictor

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muscles and muscles of the pharynx.

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Dr. P out.

Report

Description

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Temporal bone

Neuroradiology

MRI

Head and Neck

Carotid Space

Brain

Aerodigestive system

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