PMID: 6973162Apr 1, 1981Paper

Physiological characteristics of low threshold mechanoreceptor afferent units innervating frog skin

Quarterly Journal of Experimental Physiology : an International Journal of the Physiological Society
H OgawaY Yamashita

Abstract

A total of ninety-three mechanoreceptor afferent units with fast conducting axons in the sciatic nerve innervating the plantar and lateral surface of the hind foot were isolated for electrophysiological recording in anaesthetized frogs (Rana catesbeiana). Sixty-three rapidly adapting (RA) units and thirty slowly adapting (SA) units were differentiated from each other mainly on the presence of an "off' response and a slope-locked "on' response to ramp stimulation in RA units and on the persistence of discharges of the SA units during steady pressure on the receptive field. RA units were subdivided into two subgroups; RA type I units and RA type II units. The RA type I units had small well-demarcated receptive fields in which the unit was uniformly sensitive, and low indentation amplitude and velocity thresholds. The RA type II units had receptive fields consisting of several sensitive spots, associated with skin warts in the warty skin, high indentation thresholds, and the fastest conduction velocities (mean 19.9+/-4.4 m/sec) among the three groups of the units studied. RA type I units showed U-shaped tuning curves with a best tuning frequency at around 2 Hz, while tuning curves of SA units were flat from 0.1 (the lowest frequen...Continue Reading

Citations

Nov 1, 1985·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·R E Watts, A S French
Oct 13, 2010·Somatosensory & Motor Research·Daniel PressBurak Güçlü
Jan 1, 1995·Progress in Biophysics and Molecular Biology·W Hamann
Nov 9, 2012·The Journal of Experimental Biology·Duncan B Leitch, Kenneth C Catania

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