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桡神经感觉动作电位(SNAP Sensory nerveaction potential)的描记术已有作者报导。有两类逆向描记法,一种从拇指,另一种从拇、食指间间隙处描记.两种方法均为从前臂皮神经处刺激桡神经感觉纤维.在拇指处描记桡神经的SNAP,可能导致人为的误差,因为拇指受正中及桡神经两者支配.因此,当桡神经感受纤维在前臂中部用较大强度刺激时,由于刺激的扩散将同时兴奋前臂的正中神经而导致一个不纯的、高振幅的“桡神经”SNAP.
Tracing of the SNAP Sensory nerve action potential has been reported by the authors. There are two types of reverse tracings, one from the thumb and the other from the thumb and forefinger. The two methods both stimulate the radial nerve sensory fibers from the forearm cutaneous nerve. Tracing the radial nerve SNAP at the thumb may Resulting in an artificial error as the thumb is dominated by both the median and radial nerves.Thus when the radial nerve fibers are stimulated with greater intensity in the middle of the forearm, the impotence of the stimulus will excite the median nerve of the forearm causing an impure , High amplitude “radial nerve” SNAP.