CNIX Glossopharyngeal

Question 1

What are the nuclei of the glossopharyngeal nerve and what do they do?

Answer 1

Nucleus ambiguous: motor to the stylopharyngeal muscle

Inferior salivatory nucleus: parasympathetics to the parotid gland

Solitary nucleus: autonomic barrel receptor visceral afferent AND taste from the posterior 1/3 of the tongue

Nucleus of the spinal tract of the trigeminal: sensory sensation from back of throat (sensory for gag reflex)

Question 2

What information goes to the solitary nucleus?

Answer 2

1. cranial nerve 7 Facial Taste from anterior 2/3 of tongue.
2. CNIX Glossopharyngeal taste from posterior 1/3 of tongue
3. sensory information from autonomic barrow receptors from the carotid artery.

Question 3

What is the path of motor information to the parotid gland?

Answer 3

Fibers from the inferior salivatory nucleus exit through the jugular foramen and form the tympanic nerve ➡️ Postganglionic sympathetic fibers from the carotid plexus join the tympanic nerve to form the lesser petrosal nerve ➡️ The lesser petrol nerve synapses at the otic ganglion ➡️ fibers from the otic ganglion join the auriculotemporal nerve (a division of trigeminal mandibular V3) and synapse at the parotid gland to produce saliva.

Interesting note: The middle meningeal artery passes through a loop of the auricular temporal nerve before entering the foramen spinosum with the meningeal branch of the mandibular division of the trigeminal.

Question 4

What muscle does a glossopharyngeal nerve control?

Answer 4

The stylopharyngeus muscle

Question 5

What are the fibers that leave the inferior salivatory nucleus called?

Answer 5

The tympanic nerve

Question 6

How does a glypharyngeal nerve leave the skull?

Answer 6

The jugular foramen

Question 7

What symptoms do lesions of the glossopharyngeal nerve cause?

Answer 7

Aberrations and blood pressure
Sometimes pain: glossopharyngeal neuralgia
Loss of sensation in the nasopharynx
Absent gag reflex (inability to feel tongue depressor)

Question 8

What ganglion sends fibers to the parotid gland

Answer 8

Otic ganglion

Question 9

What cranial nerves run from the solitary nucleus?

Answer 9

Vegas : taste from the back of the throat and parasympathetics

Glossopharyngeal: taste from the posterior 1/3 of the tongue and visceral afferents from carotid body and sinus.

Facial: taste from the anterior 2/3 of the tongue

Question 10

What nerves run to the spinal tract of the trigeminal

Answer 10

Trigeminal: pain and temperature from the face

Glasopharyngeal: sensory from the back of the tongue and throat (necessary for gag reflex)

Vagus: sensory from the larynx pharynx in her ears and meninges (posterior)