Microelectrode recordings from 15 slowly adapting (SA) cutaneous mechanoreceptor afferents originating in hairy skin were obtained from the radial nerve in humans. 2. Controlled skin stretch was applied to the back of the hand that encompassed the physiological range of skin stretch during movements at the metacarpophalangeal (MCP) joints. 3. Both SA Group I and II afferents showed exquisite dynamic and static sensitivity to skin stretch. The median static strain sensitivity was 1.0 imp.s-1 per percent skin stretch for SAI units and 1.8 for SAII units. 4. Translated into sensitivity to movements at the MCP joint, both SAI and SAII afferents in the skin of the back of the hand displayed a positional sensitivity that was comparable with that reported for muscle spindle afferents. 5. These data give quantitative support to suggestions that skin receptors in the human hairy skin provide information on nearby joint configurations and therefore may play a specific role in proprioception, kinesthesia, and motor control.
摘要
从人类桡神经获取了15条起源于多毛皮肤的慢适应性（SA）皮肤机械感受器传入纤维的微电极记录。2. 对包含掌指（MCP）关节运动期间皮肤拉伸生理范围的手背进行了可控的皮肤拉伸。3. SA I组和II组传入纤维对皮肤拉伸均表现出极高的动态和静态敏感性。SAI单位的中位静态应变敏感性为每百分比皮肤拉伸1.0次冲动·秒⁻¹，SAII单位为1.8次冲动·秒⁻¹。4. 转化为对MCP关节运动的敏感性后，手背部皮肤中的SAI和SAII传入纤维均表现出与肌肉梭传入纤维所报告的位置敏感性相当的敏感性。5. 这些数据为以下观点提供了定量支持：人类多毛皮肤中的皮肤感受器提供有关附近关节构型的信息，因此可能在本体感觉、运动觉和运动控制中发挥特定作用。
