11 Somatosensory System Flashcards Preview

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Flashcards in 11 Somatosensory System Deck (31):
1

DC-ML: fx

conveys vibration, joint position, well localized touch

2

relay sites: DC-ML

1. caudal medulla, dorsal column nuclei (cuneate and gracile)
2. thalamus, ventral posterolateral nucleus

3

decussation: DC-ML

caudal medulla

4

first neuron: DC-ML

sensory neuron
cell body: DRG (dorsal root ganglion)
Process: dorsal column-> internal arcuate fibers (DECUSSATE)

5

second neuron: DC-ML

medial lemniscus to VPL

6

third neuron: DC-ML

VPL

7

fasciulus cuneatus: Upper Ex.

touch, pressure, vibration, join position

8

Fasiculus Gracilis: Lower ex

touch, pressure, vibration, join position

9

lesion: spinal dorsal columns

ipsilateral
loss of vibration, joint sense, well localized touch
test: 2 point touch

10

lesion: medial lemniscus

contra-lateral side
loss of vibraiton, joint sense, well localized touch
test: 2-point touch

11

lesion: VPL

contralateral loss of
vibraiton, joint sense, well localized touch
test: 2-point touch

12

Fx: spinothalamic tract

pain, temperature, light touch

13

1st: spinothalamic tract

small diameter, sensory fiber
terminate in substantia gelatinosa

14

substantia gelatinosa

dorsal horn site of control of pain from spinothalamic trac

15

2nd: spinothalamic tract

cell bodies: ipsilateral dorsal horn
decussate: white commissure of spinal chord
proceed up he ventrolateral funiculus

16

3rd: spinothalamic tract

cell bodies: VPL
processes to somatosensory cortex

17

collaterals; spinothalamic tract

reticular formation, peraqueductal gray

18

periaqueductal gray

suppresses pain

19

lesion: ventral white commissure

loss of pain, temperature, light touch at level of damage

20

lesion: ventral white commissure, spinothalamic tract

diminishes pain at the level of damage

21

fx: CN V

sensory to face, motor muscles of mastication

22

1st: CN V

sensory neurons, both pacinian corpuscles vibrations and merkel cells for light touch

23

Gasserian Ganglion

a sensory ganglion of the trigeminal nerve tucked in the cavernous sinus

24

CN V: large diameter

well localized touch (pin), pressure, vibration

25

CN V: smal diameter fibers

pain, temperature, and light touch (brush)

26

chief sensory nucleus of CN V

function: all the sensory branches of the trigeminal terminate here

located: adjacted to the middle cerebellar peduncle in the dorsolateral pons

decussate to the ventrolatleral trigeminothalamic tract

27

fx: ventral trigeminothalamic tract

proprioception, fine touch (pin), vibration

pons-> principal trigeminal nucleus-> decussate.> Ventral, Posterior, Medial Nucleus

28

dorsal trigeminal-thalamic tract

pain, temperature, light touch (brush)

pons.> medulla. spinal trigeminal tract.> spinal trigeminal complex-> decussation-> Ventroposteriolateral nucleus

29

what are the two tracts that make face sensation bilateral

ventral trigeminothalamic tract
dorsal trigeminal tract

30

lesion: lateral brain stem

damage to spinal tract and nucleus of trigeminal

causes ipsilateral loss of pain and temperature

tested with corneal reflex

31

Brown-Sequard syndrome

board question