1somatosensory_post

1somatosensory_post - somatosensation q q proprioception...

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somatosensation proprioception (position sense) touch (vibration, two-point discrimination) temperature pain
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proprioceptive receptors: mechanoreceptors GTO Spindle Golgi tendon organs respond to force on a muscle, signaled by collagen stretch muscle spindles respond to stretch on intrafusal muscle fibers
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touch receptors: skin glabrous vs hairy skin receptors are found in the dermis
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touch receptors: receptor apparatus Meissner Merkel Pacinian Ruffini Free Large dense-core vesicles •Lips •Fingertips •External Genitalia Account for 40% of mechano receptors in hand Very sensitive 100-300 Hz Large receptive field Sometimes encircle hair follicles multiple types of receptors, with different response properties all are mechanoreceptors Merkels also signal through neuropeptides all somatosensory signals are depolarizing (Na + , Ca 2+ ) they differ in receptive field size, location, and ability to adapt
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touch receptors:
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This note was uploaded on 04/18/2010 for the course BISC 421 taught by Professor Hirsch,liman,quick during the Fall '08 term at USC.

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1somatosensory_post - somatosensation q q proprioception...

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