Trigeminal Nerve

Question 1

mesencephalic nucleus

Answer 1

for sensory
@midbrain
gen proprioception from mastication muscles and periodontal ligament (position of jaw)

Question 2

principal nucleus

aka main, chief

Answer 2

for sensory @ midpons
1. discriminatory touch and pressure from orofacial structures
2. gen prop from extraocular muscles and TMJ

Question 3

spinal nucleus

Answer 3

@pons, medulla, C1-2/3 above substantia gelatinosa of spinal cord
1. nociceptive, thermal, tactile sensation from orofacial structures

pain

Question 4

motor nucleus of V

Answer 4

@mid pons made of cell bodies of motor neuron axons form motor root
1. inn muscles of mastication

Question 5

spinal tract

Answer 5

start: pons near sensory root of V
descends ipsilat in pons thru medulla to C1/2
terminates: spinal nucleus

for pain, temp, tactile

merges with lissauer tract in upper cervical

Question 6

ventral trigeminal lemniscus

Answer 6

start: spinal nucleus
ascend to thalamus
term: VPM of thalamus

pain, temp, tactile

Question 7

dorsal trigeminal lemniscus

Answer 7

start: sensory nucleus of V (main)
ascend to thalamus
term: VPM of thalamus

discriminative touch, proprioception

Question 8

trigeminoreticular fibers

Answer 8

start: sensory and spinal nucleus
project to reticular formation bilaterally
term: reticular form

for arousal via stroking or slapping face or smelling salts

Question 9

damage to ophthalmic V1

Answer 9

reduce sensation over V1 zone
-affects corneal blink reflex

Question 10

damage to maxillary V2

Answer 10

reduce or inhibit sensation over V2 zone