Even more Week 2

Question 1

Where are the primary neurons of CN7?

Answer 1

Genticulate Ganglion

Question 2

Which cranial nerve is the afferent limb of the gag reflex? Primary neuron location?

Answer 2

CN9; primary neurons in the superior ganglion of 9.

Question 3

Where are the primary neurons of CNX?

Answer 3

Superior ganglion of X.

Question 4

What is the function of the Corneal Reflex? Acoustic Reflex?

Answer 4

Corneal reflex: Protect the eye from debris and bright light.
Acoustic reflex: Protect the ear drum from loud sounds.

Question 5

What is Trigeminal Neuralgia?

Answer 5

Pain related to touch over a trigeminal region; Often over maxillary region.

Question 6

Discuss the Visceral Motor component of CN7

Answer 6

1. Innervates the lacrimal, nasal and salivary glands
2. Pre-g neurons in Superior Salivatory nucleus
3. Post-g neurons in Pterygopalatine and submandibular ganglion.

Question 7

Describe UMN lesions of CN7

Answer 7

1. Corticobulbar input to the Motor Nucleus of CN7 is not bilaterally symmetric
2. Upper Face recieves bilateral cortical input.
3. Lower Face recieves only crossed cortical input.