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Physiology

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Central Nervous System

Question
12 out of 20
 

Destruction of sensory area 1 of brain leads to loss of which sensations?



A Pain

B Touch

C Stereognosis gone but 2 point discrimination retained

D Stereognosis& 2 point discrimination

Ans. D Stereognosis& 2 point discrimination

I. Two somatic sensory areas of the cortex: -

a. 1. Somatic sensory area I (S.I) in the post central gyms and corresponds to Brodmann’s area 1, 2 and 3. Ablation of S 1 in animal causes deficit in position sense and in the ability to discriminate size and shape

b. Somatic sensory area II (S.II) the wall the sylvian fissure. Ablation of S-II causes deficient in learning based on tactile discrimination.

II. Cortical lesions do not abolish somatic sensation

a. Proprioception and fine touch are most affected by cortical lesions Q

b. Temperature sensibility is less affected, and pain sensibility is only slightly affected.Q

c. Thus, perception is possible in the absence of cortex. Q

Central Nervous System Flashcard List

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