Page 1 of 1: physio : sensory area 1.

rsvv79 · Credits: 5424 My Scrapbook

damage to sensory area 1 leads to loss of

1. pain perception
2. tactile & 2 pt discrimination
3. touch
4. tactile only

q no 92 pg 60 Salgunan 05 edn.ans given 2.any ref??

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Damage to area 1 leads to deficits in the discrimination of textures,
whereas damage to area 2 impairs the recognition of size and shapes.

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gandalf · Credits: 8395 My Scrapbook

VICTOR'S NEUROLOGY:

The posterior thalamic complex projects mainly to two somatosensory cortical areas. The first area (S1) corresponds to the postcentral cortex or Brodmann's areas 3, 1, and 2. S1 afferents are derived primarily from VPL and VPM (ventral posteromedial nucleus—the terminus of trigeminal fibers) and are distributed somatotopically, with the leg represented uppermost and the face lowermost (face and hand are juxtaposed). Electrical stimulation of this area yields sensations of tingling, numbness, and warmth in specific regions on the opposite side of the body. The information transmitted to S1 is tactile and proprioceptive, derived mainly from the dorsal column–medial lemniscus system and concerned mainly with sensory discrimination. The second somatosensory area (S2) lies on the upper bank of the sylvian fissure, adjacent to the insula. Localization of function is less discrete in S2 than in S1, but S2 is also organized somatotopically, with the face rostrally and the leg caudally. The sensations evoked by electrical stimulation of S2 are much the same as those of S1 but, in distinction to the latter, may be felt bilaterally. Of note is the failure of cortical stimulation to evoke pain sensation.

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