掌短肌(palmaris brevis,PB)是尺神经浅支支配的唯一肌肉。临床上当其受累时,患者可同时表现为尺神经感觉损害而尺神经深支不受累,如骑自行车者或使用拐杖者所见的轻度手麻痹,也可见于掌短肌痉挛综合征。本文探索用针极肌电图(EMG)检 Palmaris brevis (PB) is the only muscle dominated by the superficial branch of the ulnar nerve. Clinically, when it is involved, the patient can also be manifested as ulnar nerve sensory impairment and ulnar nerve involvement is not involved, such as cyclist or crutches were seen mild hand paralysis can also be found in the palpitus spastic syndrome. This article explores needle electromyography (EMG) examination