Trigeminal Sensory Pathways

jaw jerk reflex

mesencephalic nucleus

touch and pressure of all three branches (v1, v2, v3)

primary trigeminal nucleus

pain and temp of all three branches and CN VII, IX, X

spinal nucleus

Sensory pathway ordering system

- first order

- second order

- third order

First order neuron is what kind of neuron?

pseudounipolar neuron

sensory info is picked up both internally and externally

True

second order neuron is always located in....

the spinal cord or brainstem

which order neuron does decussation happen in?

second order

third order neuron takes neural responses to the

thalamus

the thalamus sends the signal to the _____ then takes it to _____

internal capsule, cortex

trigeminal ganglion aka

semilunar ganglion

Sensory information fed into the _______ and synapse onto a ________

semilunar ganglion, specific trigeminal nucleus

trigeminal lemniscus

touch and proprioception

trigeminothalamic

pain and temperature

most important nucleus for speech sensation

primary trigeminal nucleus

how is the primary trigeminal nucleus organized

somatotpically

3rd order neurons travel from the _______ that then travel to the ______

VPM, cortex

the VPM is located in

thalamus

VPM is organized

somatotopically

what percent of S1 is mapped to structures related to vocalization and speech?

30-40%

the pain and temperature pathway is set up

unilateral contralateral pathway

pressure and touch pathway is set up like

bilateral innervation