Pathways of the Glossopharyngeal nerve (CN 9)

Question 1

What kind of autonomics emerge from the cranial region?

Because they’re emerging from the brain, what kind of parasympathetic is it?

Answer 1

Parasympathetic

Preganglionic

Question 2

Cranial nerve 9…

Receives sensory innervation comes through where and from what?

Answer 2

Comes through the jugular foramen from..

• carotid body (CO2 levels)
• carotid sinus (pressure)

Question 3

Cranial nerve 9…
Parasympathetic preganglionic fibers travel through where to pass through the petrous portion? Then where does it go? Where does it synapse? Where do the postganglionic fibers go?

Answer 3

Pass through jugular foramen
It goes through foramen ovale
*THEN IT'S CARRIED BY V3!
Synapses in the otic ganglion
Postganglionic fibers go to parotid gland

Question 4

V3 does not carry what out of the brain?

But what is the “exception?”

Answer 4

Preganglionic parasympathetic fibers out from the brain!
It DOES carry the preganglionic parasympathetic fibers out of foramen ovale to the otic ganglion because it’s already leaving the foramen ovale while it’s bringing sensory innervation IN

Question 5

Cranial nerve 9…

Branchial motor comes out through what and goes where?

Answer 5

Comes out through the jugular foramen

Goes to stylopharyngeus (attached to derivative of arch 3)

Question 6

Cranial nerve 9…

What is the special sense?

Answer 6

Taste

Question 7

Cranial nerve 9…

The special sensory fibers travel through what and go where?

Answer 7

Travel through jugular foramen

Go to posterior 1/3 of tongue

Question 8

Cranial nerve 9…
The GENERAL sensory fibers travel through what and go where?
*what senses?

Answer 8

Travel through jugular foramen
Go to posterior 1/3 of tongue
*pain, pressure, temperature

Question 9

What innervates the rostral 2/3 of the tongue’s GENERAL sense?

Answer 9

Mandibular nerve (V3)

Question 10

What innervates the rostral 2/3 of the tongue’s SPECIAL sense?

Answer 10

Facial nerve