Anatomy - Main Sensory Nucleus (Trigeminal) Flashcards Preview

Maddy - Neuro II - tracks > Anatomy - Main Sensory Nucleus (Trigeminal) > Flashcards

Flashcards in Anatomy - Main Sensory Nucleus (Trigeminal) Deck (19)
Loading flashcards...
1

what is the main sensory nucleus (msT) sensitive to

touch and pressure

2

what is the mesencephalic nucleus (mes) sensitive to

proprioceptive affarents from TMJ and masticatory muscles
(how to chew, when to chew, etc)

3

describe the location of the mesencephalic nucleus, chief sensory nucleus, trigeminal ganglion, and spinal nucleus of trigeminal

mesencephalic: in the midbrain, most rostral
chief sensory: below mesencephalic
trigeminal ganglion: outside the CNS (DRG)
spinal: extends down spinal cord to upper cervical spine

4

function of main sensory nucleus

process proprioceptive information for head and face

5

compare the dorsomedial and ventrolateral divisions of the main sensory nucleus

dorsomedial: gets afferent input from oral cavity
ventrolateral: gets afferents from branches V1, V2, and V3

6

where are the second order neurons in the trigeminal sensory tract

in the principal sensory nculeus

7

describe the somatotopic representation of the main sensory nucleus

V1 is located most anterior
V2 in the middle
V3 is most posterior

8

what happens to neurons synapsing in the dorsomedial division of the main sensory nucleus

they travel ipsilaterally via posterior trigeminothalamic tract

9

what happens to neurons synapsing in the ventrolateral division of the main sensory nucleus

they travel contralaterally via anterior trigeminothalamic tract

10

where do neurons from the anterior and posterior trigeminothalamic tracts synapse

the ventro posteromedial nucleus (VPM)

11

neurons synapsed in VPM then travel where

through posterior limb of internal capsule and to the primary somatosensory cortex

12

name the nuclei for each:
- proprioception to lower extremity
- proprioception to upper extremity
- proprioception to face

LE: gracile nucleus
UE: cuneate nucleus
face: main sensory nucleus (trigeminal)

13

what is the mesencephalic nucleus comprised of and where is it found

comprised of pseudounipolar neurons
- found in the CNS (embedded in the brainstem)

14

where do neurons from the mesencephalic nucleus project to

to the main sensory nucleus and spinal nucleus
(some terminate in trigeminal motor nucleus to do jaw jerk reflex)

15

-motor flashcard-
how does UMN lesion affect the jaw jerk reflex?

it enhances it

16

what is the jaw jerk reflex

applying a downward tap on the chin which stretches the masseter and causes it to contract bilaterally

17

what makes up the afferent and efferent limbs of the jaw jerk reflex

afferent: peripheral processes from mesencephalic trigeminal neuron
efferent: central processes from mesencephalic trigeminal neuron that synapse on a trigeminal motor neuron

18

where do neurons from the mesencephalic nucleus and main sensory nucleus travel to relay proprioceptive information from the face to the cerebellum

neurons travel through the cerebellar peduncle

19

what nucleus sends the majority of neurons to the cerebellum to relay proprioceptive information from the face

mesencephalic
(main sensory nucleus is minor)