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Electrophysiological properties of mechanoreceptors of single sensory unit innervating toad's femoral skin


, : Electrophysiological properties of mechanoreceptors of single sensory unit innervating toad's femoral skin. Shikwa Gakuho 86(5): 825-850

Single sensory units innervating toad femoral skin were prepared for study; and response characteristics of each mechanoreceptors in the single units to rectangular-mechanical, ramp-mechanical, and vibratory stimuli applied to warts in the receptive field were investigated. 1. Numbers of skin warts in the receptive fields of 28 fast-adapting units were 12.7 .+-. 5.7; those in fields of 15 slow-adapting units were 8.8 .+-. 4.7, with a mean value of .+-. S. D. 2. In some fast-adapting units each mechanoreceptor showed on-responses to rectangular mechanial stimulation, whereas others showed both on- and on-off-responses to the same kind of stimulus. All mechanoreceptors of slow-adapting units, on the other hand, showed slow-adapting responses during the plateau phase of the same kind of mechanical stimulation. 3. Fast-adapting units may be classified as fast-adapting unit a and fast-adapting unit b(b1, b2, and b3) according to response patterns demonstrated during the dynamic and static phases of ramp mechanical stimulation. Whereas the a type bears only a fast-adapting mechanoreceptor a (critical slope; more than 1 .mu.m/ms and thermal stimulation: no response), the b type bears various kinds of mechanoreceptors (b1, b2, and b3-critical slope: less than 1 .mu.m/ms and cold stimulation: no response) on its branches. 4. All fast-adapting-unit mechanoreceptors a demonstrated similar response to vibratory stimulation. And the responses of slow-adapting-unit mechanoreceptors were similar to each other. Mechanoreceptors b1, b2, and b3 of the fast-adapting b type, however, showed different response patterns to vibratory stimulation. The upper limits (80 .apprx. 110 Hz) of fast-adapting mechanoreceptors of the b1 and b2 types with a low displacement threshold to rectangular mechanical stimulation were higher than those (30 .apprx. 40 Hz) of mechanoreceptors of the b1 and b2 types with high thresholds. Upper limits (9 .apprx. 10 Hz) of fast-adapting mechanoreceptors of the b3 type, however were the same as those obtained for slow-adapting mechanoreceptors.

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