Trigeminal Sensory System

Question 1

sensory information from the face is carried by what nerve?

Answer 1

trigeminal nerve ( CN V )

Question 2

why is the branching of the trigeminal nerve so extensive?

Answer 2

carries sensory information from the face, eyes, nasal cavity, maxillary and frontal sinuses, oral cavity

Question 3

where does the trigeminal nerve emerge from?

Answer 3

pons

Question 4

what kind of component does the trigeminal nerve have?

Answer 4

sensory and motor component

Question 5

what kind of neuron is the trigeminal ganglion

Answer 5

pseudo unipolar neuron

Question 6

three major branches of the trigeminal nerve that branch out into the face (pass info there)

Answer 6

ophthalamic nerve, maxillary nerve, mandibular nerve

Question 7

includes carrying sensory info from the eye

Answer 7

ophthalmic nevre

Question 8

carries sensory info to the middle region of the face

Answer 8

maxillary nerve

Question 9

carries sensory info to the jaw bone

Answer 9

mandibular nerve

Question 10

what are the 3 sensory nuclei of the trigeminal nerve?

Answer 10

spinal trigeminal nucleus, main sensory nucleus, mesencephalic nucleus

Question 11

receives nociceptive, touch and non-discriminative/crude touch fibers from the face

Answer 11

spinal trigeminal nucleus

Question 12

receives light touch and pressure fibers from the face; also receives proprioceptive information

Answer 12

main sensory nucleus

Question 13

associated with proprioceptive afferents from the face (misplaced ganglion)

Answer 13

mesencephalic nucleus

Question 14

begins in the mid-pons, extends to C3; blends with the substantial gelatinosa - receiving pain, temp and non-discriminative touch because of the A-delta and C fiber

Answer 14

spinal trigeminal nucleus

Question 15

where does the primary afferent fiber (trigeminal nerve & ganglia) enter?

Answer 15

mid-pons

Question 16

where is the soma of the FON (trigeminal nerve) located?

Answer 16

trigeminal ganglion

Question 17

where does the FON (trigeminal nerve) go after it enters the mid-pons?

Answer 17

descends to the caudal medulla as the spinal trigeminal tract

Question 18

where does the FON of the trigeminal nerve synapse?

Answer 18

spinal trigeminal nucleus

Question 19

where is the soma of the SON of the trigeminal nerve located? what happens after it gets there?

Answer 19

spinal trigeminal nucleus; SON crosses midline at the AWC, joins with spinothalamic tract to thalamus

Question 20

which thalamus is the C-fiber nociceptive information going to?

Answer 20

ILN (intralaminar nuclei)

Question 21

which thalamus is the A-delta fiber going to?

Answer 21

VPM (ventral posterior medial thalamic nuclei)

Question 22

where is the soma of the TON in the trigeminal nerve?

Answer 22

VPL/ILN

Question 23

what happens with the TON of the trigeminal nerve?

Answer 23

passes through the PLIC to the cortex

Question 24

which part of the cortex does the A-delta nociceptive information go to in CN-V?

Answer 24

primary somatosensory cortex (lateral)

Question 25

which part of the cortex does C-fiber nociceptive information go to in CN-V?

Answer 25

secondary somatosensory cortex, ACC, insula

Question 26

(this cortex) represents fibers being carried from LE and trunk medially ; (pain info)

Answer 26

VPL

Question 27

(this cortex) represents fibers coming from the face, nociceptive information

Answer 27

VPM

Question 28

(this cortex) represents C-fiber nociceptive information

Answer 28

ILN

Question 29

what fiber is responsible for touch and pressure in CN-V?

Answer 29

A-beta fiber

Question 30

where does the axon of the FON enter for touch and pressure?

Answer 30

mid-pons

Question 31

in CN-V: touch and pressure, what nucleus is present in the pons?

Answer 31

main sensory nucleus

Question 32

axon of FON (for touch and pressure) passes into this once entering the mid-pons?

Answer 32

main sensory nucleus V, synapse occurs here

Question 33

where is the soma of the FON for CN-V touch and pressure?

Answer 33

trigeminal ganglion

Question 34

some axons of SON represent (?) and can stay (?)

Answer 34

1. oral cavity | 2. ipsilaterally

Question 35

SON of the (?) crosses (?) to the thalamus and cortex, while SON of the (?) can remain (?) going to the thalamus and cortex making it (?)

Answer 35

1. face 2. contralaterally 3. oral cavity 4. ipsilaterally 5. bilateral

Question 36

what tract are the axons of the SON that remain ipsilateral repping oral cavity only traveling in?

Answer 36

posterior (dorsal) trigeminal tract

Question 37

the fibers of the SON axons crossing contralaterally repping face and oral cavity join with (?) and the fibers can be referred to as (?)

Answer 37

1. medial lemniscus | 2. trigeminal lemniscus