Biol 216 6 Brain & Nervous System 97-123.pdf

Biol 216 6 Brain & Nervous System 97-123.pdf - Sensory...

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5/19/17 1 Sensory Regions in the Brain: The Big Picture Primary Somatosensory Area Located in the parietal lobes of each hemisphere Integrates information regardingtouch/pressure, temperature, pain Stimulate portions of the primary somatosensory area causes tingling in related body parts on the opposite side of the body
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5/19/17 2 Primary Motor Area Located anterior to the primary somatosensory area Stimulate portions of the primary motor area causes movements of specific body parts on opposite sides of the body. Homunculus- “Little Man” Representation of the correlation between areas of the body from which sensory information projects to areas in the primary somatic sensory cortex. In this type of representation, the size of variousregions in the primary somatic sensory cortex is related to the number of sensory receptors in the correspondingpart of the body. 14-100
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5/19/17 3 Homunculus representation also can be used to describe motor cortex-body relationship Note the relative areas of the sensory and motor cortex devoted to different body regions Association Areas: Integration These areas surround the sensory and motor areas Function in: Integrating informationfrom the sensory areas Formulate responses Transmit the responses tothe motor cortex
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5/19/17 4 Association Areas: Language Wernicke’s Broca’s White matter tracts (fasiculus; eg, uncinate fasciculus) connects Wernicke’s to Broca’s PET Scan positron emission tomography Reveals function. Ingest/inject radioactively labeled material (like glucose). Active cells in the brain take up glucose.
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5/19/17 5 Speech To speak a word that you see: 1. APs from eye reach the primary visual cortex wheretheword is seen 2.The word is then recognized in thevisual association area 3. Word is understood in parts ofWernicke’s area 4. APs representing theword are conducted through association fibers that
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  • Spring '14
  • BarbaraKuemerle

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