N15 - Somatosensory (Tberry) Flashcards Preview

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Flashcards in N15 - Somatosensory (Tberry) Deck (28):
1

4 subdivisions

S-I cortex

only 1 is seen on the surface

2 lies along postcentral sulcus

3a is gutter of central sulcus

3b lies along central sulcus

2

S-I thalamic inputs:

proprioceptors

3a

Position

3

S-I thalamic inputs:

tactile receptors

3b

Touch

4

S-I thalamic inputs:

Rapid adapting

Touch receptors

1

Texture

5

S-I thalamic inputs:

tactile receptors & proprioceptors

rapid & slow adapting touch receptors

2

Size & shape

6

most sensory informaiton enters what 2 areas of S-I cortex?

3a

3b

From thalamocortical inputs - VPL & VPM

7

tells us what we've been touched by

S-1:  areas 1 & 2

8

S-1 somatotopy:

Complete, exquisite

3b

1

9

S-1 somatotopy:

Courser, cruder

3a

2

10

S-II cortex

parietal opercular cortex

11

sparse direct thalamic inputs

S-II

12

bilateral somatotopic map

S-II

(Different from S-I --> contains somatotopy for contralateral side only)

13

Place where serious processing takes place

5&7

14

Superior parietal lobule

area 5&7

15

Sorts out which stimuli are important at the time

Somatosensory association cx

aka - multimodal association cx

aka - brodman's area 5 & 7

16

SI/SII

somatosensory

17

Premotor cx

motor plans

18

limbic system

motivation/emotion

19

vestibular system

body position

20

mental self-image

5 & 7

21

receives input from:

limbic, visual, auditory, vestibular systems

5 & 7

Multi-modal association

22

neglect syndrom

5 & 7

23

contralateral loss of all primary and secondary modalities to body areas represented in cortical area loss

primary somatosensory cortex

24

Loss of secondary modalities even in primary somatorsensory cortex is intact

(pt can feel touch, but not define what it is)

Superior parietal lobule lesion

25

non-dominant lesion

(lesion on opposite side of language area)

 

extinction phenomenon

- aka double simultaneous stimulation

26

isolated stimulation is fine

double stimulation (at same time), can only feel on dominant side

Extinction phenomenon

27

Phantom limb:

Touch upper lip and feel______

index finger

28

Phantom limb:

Touch arm and feel _________

little finger