Cranial Nerve V

Question 1

CNV axon fiber types

Answer 1

1. general sensory afferent

2. Special visceral efferent

Question 2

general sensory afferent CNS origin and termination

Answer 2

spinal and main sensory nuclei and mesencephalic nucleus (proprioception of jaw)

Question 3

general sensory afferent PNS origin or termination

Answer 3

skin and deep tissues of head, dura

muscle spindles and other mechanoreceptors

Question 4

special visceral efferent CNS origin or termination

Answer 4

trigeminal motor nucleus (innervates all pharyngeal arch muscles)

Question 5

special visceral efferent PNS origin or termination

Answer 5

MOM and the tensor twins

Question 6

function of the trigeminal nerve

Answer 6

transmits tactile, proprioceptive, pain and temperature from head to cortex (also cerebral and reticular formation)

Question 7

three divisions of the trigimal nerve

Answer 7

1. Ophthalmic division- upper face (sensory only)
2. Maxillary division- middle face (sensory only)
3. mandibular division- lower face (sensory and motor)

Question 8

what division of the trigeminal nerve is sensory and motor

Answer 8

(Viii) mandibular division

Question 9

what trigeminal nucleus in the midbrain

Answer 9

trigeminal mesencephalic nucleus

Question 10

what trigeminal nucleus is in the pons

Answer 10

tirgminal main sensory nucleus

Question 11

what trigeminal nucleus is in the medulla

Answer 11

trigeminal spinal nucleus

Question 12

the trigeminal pathway is close to the _____ in the pons

Answer 12

descending corticospinal fibers

Question 13

where does the trigeminal motor nucleus terminate

Answer 13

in muscles of mastication

Question 14

lesions of the trigmeinal motor nucleus cause

Answer 14

jaw closure weakness , opened jaw will deviate toward the weak side

Question 15

trigeminal motor nucleus location

Answer 15

pons

Question 16

supratrigeminal nucleus location

Answer 16

right above the trigeminal motor nucleus in the pons. very tightly connected to the trigeminal motor nucleus and can’t see distinctly. part of reticular formation

Question 17

function of supratrigeminal nucleus

Answer 17

pattern generator for masticatory rhythm

Question 18

jaw jerk reflex innervated by?

Answer 18

CN V motor nucleus

Question 19

the CNV mesencephalic nucleus is

Answer 19

sensory afferent

Question 20

the mesencephalic nucleus senses

Answer 20

proprioception; spindles in muscles of mastication, mechanoreceptors in gums, teeth and hard palate

Question 21

CN V mesencephalic nucleus function

Answer 21

proprioception; regulate chewing motion; controls distance between mandible and maxilla

Question 22

what are the mesencephalic nucleus receptors

Answer 22

neuromuscular spindles of mastication muscles, pressure/tensionreceptors in periodontal ligaments

Question 23

the mesencephalic nucleus cell bodies are

Answer 23

unipolar cell bodies

Question 24

where does the mesencephalic nucleus project to

Answer 24

trigeminal motor nucleus, supratrige minal nucleus

Question 25

the CNV main sensory nucleus function

Answer 25

vibration, proprioception, and discriminative touch for face and mouth and meninges

Question 26

CNV main sensory nucleus cell bodies are located in the

Answer 26

trigeminal ganglion

Question 27

one of the ascending pathways of the CNV main principal sensory nucleus join the _____ on its way to the _____

Answer 27

medial lemniscus pathway , VPM

Question 28

the other ascending pathway of the CNV main sensory nucleus is ____ and part of the _______ inside of the mouth to the VPM

Answer 28

uncrossed, dorsal trigeminal tract

Question 29

spinal trigmenal nucleus is

Answer 29

sensory affferent

Question 30

spinal trigeminal nuclues functions

Answer 30

pain, crude touch and temp to the face, oral cavity teeth, meninges (why headache can seem like toothache)

Question 31

spinal trigeminal nucelus has similarity to

Answer 31

lissauer's tract and posterior horn

Question 32

the afferent first order neurons of spinal trigeminal tract synapses in

Answer 32

the caudal nucleus

Question 33

second order neurons of spinal trigmenal tract

Answer 33

send axons across midline, ascend and join spinothamaic tract

Question 34

spinal trigminal tract terminates in

Answer 34

VPM

Question 35

trigeminal spinal nucleus has ____ projections to VPM of thalamus

Answer 35

contralateral

Question 36

the main.principle trigmeinal sensory nucleus has ____ projections to the VPM

Answer 36

bilateral; and stays ipsilateral

Question 37

_____ branches of the ________ neurons innervate master muscle spindles

Answer 37

peripheral, mesencephalic

Question 38

major connections of trigmeinal nerve

Answer 38

1. peripheral branches 2. tactile afferents 3. motor neuron fibers 4. pain-temp afferent

Question 39

3 nuclei of the spinal trigeminal nucleus

Answer 39

pars oralis, pars interpolaris, pars caudalis

Question 40

onion peel representation - rostral (oral) to caudal (peripheral face)

Answer 40

pars caudalis

Question 41

primary pain fibers of CNV located in the

Answer 41

pars caudal

Question 42

substantia gelatoniosa (lamina II) contains

Answer 42

excitatory and inhibitory interneurons

Question 43

the substantial gelatinous receives fibers from

Answer 43

the raphe spinal tract serotonin)

Question 44

pars caudal receives afferents from CN

Answer 44

VII IX and X

Question 45

where are the three somatopotopic arrangements of pain and temperature afferents in spinal trigmeinal nucleus in pars caudal located

Answer 45

1. mandibular division:dorsal 2. maxillary: middle 3. ophthalamic: ventral

Question 46

fibers representing center of face are found

Answer 46

near the end of obex

Question 47

fibers representing back of face end in

Answer 47

upper cervical cord

Question 48

the more ___ the spinal trigeminal tract injury the larger the area around the mouth is spared of sensory loss

Answer 48

caudal