topography and plasticity

topography and plasticity - Topography 1 Somatosensory...

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Topography 1. Somatosensory pathway =“SOMATOTOPIC ARRANGEMENT” :There’s specific order in CNS where regions that are adjacent to each other in the body are represented close to each other in the CNS --1) the spatial organization within the CNS is maintained ex) sensory information from hand remains next to sensory information from arm throughout the CNS(in cortex, caudal medulla, thalamus) --2) Densely innervated areas of the body occupy large regions in the cortex. a. Cortex -cortical neurons respond to discrete areas on the surface of the skin. -cortical cells located medially will respond to lower regions of the body (when foot/toe are stimulated) -as move laterally, cells respond to upper region of the body. *homunculus; depicts the body surface with each area drawn in proportion to the size of its representation in the primary somatosensory cortex. -ex) cortical cells responding to hand and lips are over-represented. (there are lot of cortical cells responding to the hand/lips) - Areas that are adjacent to each other on skin are adjacent to each other in somatosensory cortex. b. Caudal Medulla -in dorsal region of caudal medulla, information is topographically organized: caudal to rostral information about the body is represented in medial-to-lateral direction. -neurons that convey information about lower body located medially.
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topography and plasticity - Topography 1 Somatosensory...

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