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Physiology

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Central Nervous System

Question
21 out of 22
 

Ablation of the ‘somatosensory area 1’ of the cerebral cortex leads to:



A Total loss of pain sensation

B Total loss of touch sensation

C Loss of tactile localization but not of two point discrimination

D Loss of tactile localization and two point discrimination


Ans. D Loss of tactile localization and two point discrimination

Lesion of post central gyrus( SSA -1)

  1. Decreases the sensations, but do not entirely abolish them.

a. Fine touch & proprioception are almost totally lost.

b. Temp. sensibility less affected.

c. Pain sensibility only slightly affected. Q

NOTE: A certain degree of perception is possible in the absence of cortex. Q

  1. Upon Recovery:

a. Pain sensibility returns first. Q

b. Followed by temperature sense.

c. & finally proprioception & fine touch. Q

Central Nervous System Flashcard List

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