Finger joint movement sensitivity of non-cutaneous mechanoreceptor afferents in the human radial nerve.
Finger joint movement sensitivity of non-cutaneous mechanoreceptor afferents in the human radial nerve.
复制标题
人类桡神经非皮肤机械感受器传入的手指关节运动敏感性。
DOI：
10.1007/bf00231261
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发表时间：
1990
影响因子：
2
通讯作者：
Edin,BB
中科院分区：
文献类型：
--
作者：
Edin,BB
用桡神经单次传入记录法研究了正常手指运动时人手非皮肤感受器的反应。8个关节相关传入的阈值为50 mN或更低。所有的被动屈曲运动的生理范围内的关节旋转，并表现出主要的静态反应灵敏度，没有增加其在被动扩展的放电。然而，只有两个这八个传入表现出相同的反应模式，在主动运动，三个只在伸展阶段，而其他三个在伸展和屈曲放电。没有高阈值，关节相关的mechanoreceptive传入遇到的人口148传入记录从桡神经的皮肤部分，表明缺乏这样的传入手指关节的背面。七个高阈值，皮下mechanoceptive单位不相关的关节阈值压痕50毫牛顿或以上，缺乏对手指运动的反应。因此，与人手中的关节相关的低阈值机械感受性传入可以在被动和主动运动的生理中档中提供运动学信息。然而，关节位置不能从它们的放电中明确地推导出来，因为受体反应可能会被肌肉活动显著改变。
The responses of non-cutaneous receptors in the human hand to normal digit movements were studied using single afferent recordings from the radial nerve. Eight joint-related afferents had thresholds of 50 mN or less. All responded to passive flexion movements within the physiological range of joint rotation and showed predominantly static response sensitivity; none increased its discharge during passive extension. However, only two of these eight afferents showed the same response pattern during active movements; three discharged only during the extension phase whereas the other three discharged both during extension and flexion. No highthreshold, joint-related mechanoreceptive afferents were encountered in a population of 148 afferents recorded from the cutaneous portion of the radial nerve indicating a scarcity of such afferents on the dorsal aspect of finger joints. Seven high-threshold, subcutaneous mechanoreceptive units not related to joints had thresholds for indentations of 50 mN or more and lacked responses to finger movements. Low-threshold mechanoreceptive afferents related to joints in the human hand may thus provide kinematic information in the physiological midrange of both passive and active movements. Joint position cannot, however, be derived unambiguously from their discharge since the receptor responses may be dramatically altered by muscle activity.