The Somatosensory System_outline

The Somatosensory System_outline - The Somatosensory System...

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The Somatosensory System Somatosensory o System – relays info. about the body to the brain o Receptors (biggest set of receptors) None in the brain *** 1.) Exteroreceptive – external stimuli 2.) Proprioceptive – body position 3.) Interoceptive – body conditions 4 Major Somatic Modalities o 1) Discrimination of touch – mechanical info; recognize shape, size, touch, etc o 2) Temperature Senses (hot & cold) – only up to a certain point, then sends pain signal o 3) Proprioception – static position of body and limbs o 4) Nociception (pain ) – designed to signal tissue damage or potential tissue damage Somatosensation o Sense of touch o Steps to Sensation 1) Stimuli activates receptive field on receptor 2) Affects ionic permeability of the receptor’s membrane 3) Change in permeability triggers and AP (2 types of skin) Hairy Skin o Hair follicles- hair movement o Ruffini corpuscles –respond to indentation of the skin o Pacinian corpuscles – respond to rapid vibration; longest
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o Free nerve endings- pain o Glabrous skin = hairless skin Glabrous skin Much more sensitive Ex.) palms of hands, soles of feet, lips, external genitalia 0. Ruffini corpuscles, Pacinian corpuscles, Free nerve endings o Meissner’s corpuscles respond to low-frequency vibrations and taps on the skin
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This note was uploaded on 04/28/2008 for the course PSYCHOLOGY 210 taught by Professor Davis during the Spring '08 term at University of Tennessee.

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The Somatosensory System_outline - The Somatosensory System...

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