Lum P B, Kanakamedala R
Arch Phys Med Rehabil. 1986 Nov;67(11):805-6.
The palmar cutaneous branch of the median nerve (PCBMN) usually arises about 5.5cm proximal to the radial styloid and innervates skin of the thenar eminence. The nerve may be injured by direct trauma or during surgery at the wrist. The action potential of the nerve was recorded in 50 nerves of 25 normal subjects, by antidromic stimulation of the median nerve 10cm from the surface recording electrode over the midthenar eminence. The mean latency and mean amplitude of the evoked response were 2.6 +/- 0.2msec and 12 +/- 4.6 mu v, respectively. The mean duration of the evoked potential was 1.78msec. The technique is simple and may be useful in evaluating lesions of the PCBMN.
正中神经掌皮支（PCBMN）通常在桡骨茎突近端约5.5厘米处发出，支配鱼际隆起处的皮肤。该神经可能因直接创伤或手腕手术而受损。通过在鱼际隆起中部表面记录电极上方距正中神经10厘米处进行逆向刺激，在25名正常受试者的50条神经中记录了该神经的动作电位。诱发反应的平均潜伏期和平均波幅分别为2.6±0.2毫秒和12±4.6微伏。诱发电位的平均持续时间为1.78毫秒。该技术简单，可能有助于评估正中神经掌皮支的病变。
