Central Nervous System
Destruction of sensory area 1 of brain leads to loss of which sensations?
|C||Stereognosis gone but 2 point discrimination retained|
|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