School of Physical Therapy, Belmont University, Nashville, Tennessee, USA.
Clin Anat. 2010 Mar;23(2):227-33. doi: 10.1002/ca.20916.
A recent cadaver study described that 25% of the superficial radial nerves (SRN) investigated sent a contributing nerve branch into the first dorsal interosseous (1DI) muscle. This high degree of anatomical variation was unexpected, as the 1DI muscle is typically viewed as receiving its innervation from the ulnar nerve. The purpose of this study was to explore this possible SRN innervation of the 1DI muscle using electrophysiological tests on living subjects. Fourteen subjects participated and procedures were completed on their upper extremities bilaterally. Subjects were positioned supine and testing for the presence of a compound motor action potential (CMAP) was completed to determine if the 1DI muscle could be stimulated with activation of the ulnar nerve and the SRN. In all the 28 extremities examined, ulnar nerve stimulation resulted in clear elicitation of a CMAP in the 1DI muscle but stimulation of the SRN did not. The obtained findings do not support an atypical voluntary motor innervation of the 1DI muscle by the SRN with an incidence approaching the 25% reported previously.
最近一项尸体研究描述，25%被调查的浅层桡神经（SRN）向第一背间骨间肌（1DI）发送了一个分支。这种高度的解剖变异是出乎意料的，因为 1DI 肌肉通常被认为是由尺神经支配的。本研究的目的是使用活体受试者的电生理测试来探索这种可能的 SRN 对 1DI 肌肉的支配。14 名受试者参与了研究，他们的上肢双侧都完成了相关程序。受试者仰卧位，进行复合运动动作电位（CMAP）检测，以确定尺神经和 SRN 的激活是否可以刺激 1DI 肌肉。在检查的 28 个肢体中，尺神经刺激均能在 1DI 肌肉中清楚地引出 CMAP，但 SRN 刺激则不能。研究结果不支持 SRN 对 1DI 肌肉进行非典型的随意运动支配，其发生率接近先前报道的 25%。
