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15 Cards in this Set
- Front
- Back
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What is the rate of adaptation for Pacinian Corpuscles?
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Very fast - Only see spikes at onset and offset
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Pacinian corpuscles are tunes to what frequency vibrations?
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200-300 Hz
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Which dorsal root axons are most sensitive to anoxia (axon killing)?
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The biggest (I>II>III>IV)
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What dorson root axons are most sensitive to local anesthetic?
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The smallest (pain/temp)
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What is the receptive field of a cell?
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The portion of the skin which when appropriately stimulated affects the firing of the cell
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Which has a larger receptive field, pacinian or messners corpuuscles?
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Pacinian (much larger)
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2 point discrimination is best for what body regions?
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Those with the highest innervation density and amount of cortical area devoted to them (ie fingers / lips)
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The presence of inhibitory interneurons does what?
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Aids in enhancement of contrast of a signal and makes it far better
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In S1 3a area is what?
3b? 2? 1? |
3a = muscle afferents
3b = cutaneous receptors 2 = deep pressure receptors 1 = rapidly adapting cutaneous receptors |
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How many body representations are seen in S1?
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4 (correspond to previous 4 categories)
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When digit 3 is amputated, what is seen in the cortical representation of 2 and 4?
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Increase in size and have DECREASED receptive fields
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Where is affect processed?
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In a different region than S1; namely cingulate gyrus
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What was seen int he hyponotizing studies?
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That affect (percieved unpleasantness of situation) affected how painful a pain stimuli was reported
But intensity remained the same |
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What thalamic nucleus provides input to the cingulate gyrus?
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Anterior Nucleus of the thalamus
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What is the major input to the anterior nucleus of the thalamus?
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Mammillary Bodies
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