PSL300H1 Lecture 8: lecture 8

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13 Dec 2011

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Sensory axons classified by size and conduction velocity only mechanoreceptors (50 m/s: a - large diameter, myelinated, a small diameter, myelinated, c small diameter, unmyelinated (1 m/s) Mechano-, thermo-, and nociceptors (10 m/s) slow conducting sensory endings are in the upper and lower parts of the dermal layers sensory endings are associated with external cells that form a capsules (corpuscle) o o. Meissner small and shallow receptive field rapidly adapting. Slowly adapting responds to maintained pressure on the skin. Small receptive field threshold response to skin indentations of 20 microns stimulation of axon gives sensation of leaf pressing against receptive field gives sense of body position and where everything is relative to the body. Muscle spindle adequate stimulus is passive stretch (group ia afferents) Found right in the belly of the muscle tissue and activated by stretching. Golgi tendon organ adequate stimulus is active force (group ib afferents) o.

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PSL300H1 Lecture 8: lecture 8

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