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Exit of the Glossopharyngeal Nerve

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Dr. P here talking about the glossopharyngeal

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or 9th cranial nerve,

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arising from the medulla oblongata.

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Here's 9, 10, and 11 right here.

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And the nerve passes anterolaterally.

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So, let's go down.

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Now, it courses right next to the flocculus,

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part of the flocculo nodular lobe of the cerebellum.

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Here's the flocculus.

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So, you can see the close proximity

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of the glossopharyngeal nerve to the flocculus.

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Here's the glossopharyngeal nerve.

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There's the flocculus right next to it.

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And then we follow it into the region of the jugular fossa,

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which is going to be right here.

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Now, it's difficult to follow contiguously,

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but you see part of it right there.

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And again,

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we're going to talk about nerves 9, 10, and 11 together.

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They're all going into the jugular foramen through

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the central part of the jugular foramen.

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Not as easily seen on this T1-weighted image,

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but it is seen, as it is on this T2-weighted

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cisternographic image.

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Now, as the nerve hits the jugular foramen,

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I want to talk about what happens in here,

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which is very difficult to see anatomically.

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But you've got superior and inferior ganglia in the jugular foramen,

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and they have their own sheath of dura mater.

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The inferior ganglion sits on the inferior surface of the

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petrous part of the temporal bone and is

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related with a triangular depression into which

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the aqueduct of the cochlea actually opens.

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Let's have a look at that anatomic information on CT.

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So on this accompanying CT image,

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you see a triangular shaped space in the region of the

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jugular fossa with the jugular tympanic spine.

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And this is known as the petrosal fossula

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and contains the inferior ganglion of nine.

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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

Neuroradiology

MRI

Head and Neck

Carotid Space

Brain

Aerodigestive system

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