S3: Trigeminal System

Question 1

Most somatosensory information from the head and neck enters the CNS via___ axons

Answer 1

CN 5

Question 2

Axons of the trigeminal nerve conveying epicritic sensation synapse immediately in the _____

Answer 2

principal sensory nucleus of CN 5 and in the pontine part of the spinal n. of 5

Question 3

after synapsing in the principal sensory nucleus of CN 5 and in the pontine part of the spinal n. of 5, axons carryign epicrtic infor travel to the

Answer 3

medial lemniscus on the other side

Question 4

from the medial lemniscus, epiticrtic from head and neck synapses in the

Answer 4

vpM

Question 5

from the VPM, epicritic from head and neck synapses in the

Answer 5

post central gyrus

Question 6

damage to epicritc sesnation on same side would have to be lesion of

Answer 6

1. CN 5, trigeminal ganglion
2. principal sensory nucleus of 5 or the spinal nucleus of 5

Question 7

damage to epicritc sesnation on opposite side would have to be lesion of

Answer 7

1. medial lemniscus
2. VPM of the thlamaus
3. post central gyrus

Question 8

proprioceptive info from upper body and lower body is brought up to the cerebellum on the same or opposite side?

Answer 8

same side. spinocerebellar crosses and then recrosses

Question 9

damage to epicritc sesnation on same side would have to be lesion of

Answer 9

1. CN 5, trigeminal ganglion

2. principal sensory nucleus of 5 or the spinal nucleus of 5 in the pons

Question 10

conveying protopathic from the head and neck descend toward the spinal cord as the

Answer 10

spinal tract of CN 5,

Question 11

carrying protopathic from head and face, the spinal tract synapses in the

Answer 11

spinal nucleus in the medulla

Question 12

from the spinal nucleus in the medulla proppathic info –>

Answer 12

crosses the midline and synapses mostly in the reticular formation

Question 13

after syanpsing in the reticualr formation, axons carrying propathic from head and face travel to the

Answer 13

VPM and other parts of the thalamus like the intralaminar nuceli

Question 14

ipsilateral loss of propathic of head and neck is X of

Answer 14

1. spinal tract of CN 5
2. spinal n. of 5 in the medulla

Question 15

contralateral loss of propathic from head and neck

caused by X of

Answer 15

1. after the spinal nulceus in the medulla (where it crosses) so a pons or midbrain region
2. in the vpm

Question 16

proprioceptive input from the face

Axons in the trigeminal nerve are continuous with the neurons of the____

Answer 16

mesencephalic nucleus of CN 5

Question 17

from the mesencephalic nucleus of CN 5, propicopetive from the face continues as the emscenepahic tract of CN 5

and synapses on the CN nucleus of 5 for ____

Answer 17

jaw reflexes

Question 18

from the mesencephalic nucleus of CN 5, propicopetive from the face continues as the emscenepahic tract of CN 5

and synapses via the reticular formation before projecting to the

Answer 18

cerebellum

Question 19

mtoor component of trigeminal nerve

Axons arise from cells in the motor nucleus of CN 5 in the

Answer 19

pons

Question 20

Axons arise from cells in the motor nucleus of CN 5 in the pons and innervate the muscles of mastication on the ____ side.

Answer 20

same