QS Study

The postcentral gyrus is a prominent gyrus in the lateral parietal lobe of the human brain. Damage may produce an alteration in personality, a loss of normal inhibitions and incontinence. This area receives sensory feedback from joints and tendons in the body and is organized in the same manner as the motor strip.

Effect of damage of postcentral gyms of the right side: Functional areas present in postcentral gyrus: The primary somesthetic area (Brodmann’s area 3,2 & 1). All nerve fibers connecting the cerebral hemispheres with the cerebellum and spinal cord pass through the brainstem, controlling all functions in the limbs and body.

Postcentral Gyrus of Right Side 1

Fig: Postcentral Gyrus 

Effects of lesion: A significant percentage of patients with lesions that invaded the face area had mild to severe sensory deficits on the side of the face contralateral to the lesion. A much smaller number of patients had deficits on the ipsilateral side.

  1. The lesions of the primary somesthetic area result in contralateral sensory disturbances which are most severe in the distal parts of the limbs.
  2. The patient remains unable to judge degrees of warmth, unable to localize tactile stimuli accurately, and unable to judge the weight of objects.
  3. Loss of muscle tone of the contralateral side.
  4. Lesions to the face area in the primary sensory cortex were, however, associated with a lower incidence of severe and persistent sensory deficits when compared to previous results on the effects of lesions to the hand area on the sensory capacity of the hand.
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