CN V, VII

Question 1

What are the 3 spinal trigeminal nuclei

Answer 1

Oral nucleus, interpolar nucleus, caudal nucleus

Question 2

T/F: the main trigeminal sensory nucleus is comparable to the posterior column-medial lemniscus system for the head.

Answer 2

True

Question 3

T/F: Spinal trigeminal nucleus: descriminative touch

Answer 3

False. spinal trigeminal nucleus receives info concerning pain and temp for the head

Question 4

T/F: spinal trigeminal tract contains descending fivers from cell bodies in trigeminal ganglion.

Answer 4

True. They descend and then synapse in the caudal nucleus; 2nd neurons decussate in the caudal medulla & ascend with the spinothalamic tract. terminate in the VPM of thalamus

Question 5

T/F: spinal mesencephalic nucleus is responsible for proprioception of the jaw.

Answer 5

True

Question 6

How are the afferent fibers arranged that come from the face? (where do fibers from the central face go? fibers from back of the face?

Answer 6

Mandibular division: dorsal

Opthalmic: ventral

Maxillary: in between fibers from center end near obex

fibers from back of face end in upper cervical cord

Question 7

Branches of what artery are most involved in trigeminal neuralgia?

Answer 7

superior cerebellar artery

Question 8

Mesencephalic nucleus – Heavily myelinated fibers Posterior column homologue– medial lemniscal system Proprioception

Main sensory nucleus - Heavily myelinated fibers Posterior column homologue – medial lemniscal system Discriminative touch

Spinal nucleus – Lightly myelinated fibers Homologue of anterolateral system Pain, crude touch, temperature

Answer 8

You just need to know all that info…

Question 9

What is the supratrigeminal nucleus responsible for?

Answer 9

chewing (rhythmic pattern)

Question 10

What are the targets for the trigeminal motor nucleus?

Answer 10

m. of mastication two tiny tensor ms. ant. belly of digastric m. mylohyoid

Question 11

How many synapses are involved in the jaw-jerk reflex?

Answer 11

monosynaptic

Question 12

What are the afferent and efferent neurons involved in the jaw-jerk reflex?

Answer 12

afferent: mesencephalic V neuron (innervating masseter spindle) efferent: V motor nucleus

Question 13

What are the functions of the facial nerve?

Answer 13

innervation of orbicularis oris and oculi lubication of the cornea produce saliva from submandibular gland sensory information from skin of outer ear

Question 14

Why might you see lower face paralysis on one side while the upper face muscles remain unaffected?

Answer 14

Lower faciall muscles are innervated contralaterally while upper facial muscles are innervated bilaterally

Question 15

Is Bell’s palsy typically unilateral or bilateral?

Answer 15

unilateral (less than 1% of the time is bilateral)

Question 16

What are the afferent and efferent limbs of the corneal blink reflex?

Answer 16

afferent: Vi to Spv tract efferent: VII elicited by bilateral projection from SpV nucleus/reticular formation

Question 17

What type of fibers are in the mesencephalic nucleus? What is their main function?

Are they homologous to any other pathway?

Answer 17

heavily myelinated fibers

proprioception

homologous to posterior column medial lemniscus pathway

Question 18

What type of fibers are in the spinal nucleus (of trigeminal tract)?

What is their main function.

Are fibers in this tract homologous to any other tracts?

Answer 18

lightly myelinated fibers

pain, crude touch, temperature

homologue of anterior system

Question 19

What type of fibers are found in the mains sensory nucleus of trigeminal nucleus?

What is their main function?

Are they homologous to any other tracts?

Answer 19

heavily myelinated fibers

function: descriminative touch

homologous to posterior column medial lemniscus pathway