N15 - Somatosensory (Tberry)

Question 1

4 subdivisions

Answer 1

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

Question 2

S-I thalamic inputs:

proprioceptors

Answer 2

3a

Position

Question 3

S-I thalamic inputs:

tactile receptors

Answer 3

3b

Touch

Question 4

S-I thalamic inputs:

Rapid adapting

Touch receptors

Answer 4

1

Texture

Question 5

S-I thalamic inputs:

tactile receptors & proprioceptors

rapid & slow adapting touch receptors

Answer 5

2

Size & shape

Question 6

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

Answer 6

3a

3b

From thalamocortical inputs - VPL & VPM

Question 7

tells us what we’ve been touched by

Answer 7

S-1: areas 1 & 2

Question 8

S-1 somatotopy:

Complete, exquisite

Answer 8

3b

1

Question 9

S-1 somatotopy:

Courser, cruder

Answer 9

3a

2

Question 10

S-II cortex

Answer 10

parietal opercular cortex

Question 11

sparse direct thalamic inputs

Answer 11

S-II

Question 12

bilateral somatotopic map

Answer 12

S-II

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

Question 13

Place where serious processing takes place

Answer 13

5&7

Question 14

Superior parietal lobule

Answer 14

area 5&7

Question 15

Sorts out which stimuli are important at the time

Answer 15

Somatosensory association cx

aka - multimodal association cx

aka - brodman’s area 5 & 7

Question 16

SI/SII

Answer 16

somatosensory

Question 17

Premotor cx

Answer 17

motor plans

Question 18

limbic system

Answer 18

motivation/emotion

Question 19

vestibular system

Answer 19

body position

Question 20

mental self-image

Answer 20

5 & 7

Question 21

receives input from:

limbic, visual, auditory, vestibular systems

Answer 21

5 & 7

Multi-modal association

Question 22

neglect syndrom

Answer 22

5 & 7

Question 23

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

Answer 23

primary somatosensory cortex

Question 24

Loss of secondary modalities even in primary somatorsensory cortex is intact

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

Answer 24

Superior parietal lobule lesion

Question 25

non-dominant lesion

(lesion on opposite side of language area)

Answer 25

extinction phenomenon

• aka double simultaneous stimulation

Question 26

isolated stimulation is fine

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

Answer 26

Extinction phenomenon

Question 27

Phantom limb:

Touch upper lip and feel______

Answer 27

index finger

Question 28

Phantom limb:

Touch arm and feel _________

Answer 28

little finger