Touch - Touch Smell is a distant sense (potentially far way...

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Touch Smell is a distant sense (potentially far way smells can still be detected, volatile molecules can be carried downwind whereas taste is a proximate sense) Touch is considered a proximate sense, tactile sensation provide info about things happen on the surface of the skin Incephilization – centralization of the nervous system, in our species the brain located in the head Somatosensory system o Signal travels from receptor endings in the fingertip (or wherever) to spinal cord through dorsal root o 2 pathways from there: the medial lemniscus and the spinothalamic tract to the thalamus and somatosensory cortex Receptors of the somatosensory system o Skin Epidermis – upper layer Meissner corpuscle and Merkel’s disks – respond to mechanical depression of the skin Dermis – deeper layer Pacinian corpuscle and Ruffini’s corpuslce Free nerve endings – no specialized structures at the end, they respond to temperature, pain, irritation. Travel spinothalamic tract
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This note was uploaded on 11/27/2011 for the course PSYC 225 taught by Professor Staff during the Fall '10 term at UNC.

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Touch - Touch Smell is a distant sense (potentially far way...

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