四肢肌肉无萎缩，双上肢肌力Ⅲ级，双下肢肌力Ⅱ级：腹壁反射（+）、双侧肱二头肌反射、桡反射、膝反射、踝反射均消失，四肢肌张力减低。
Muscles of all extremities had not atrophy . The upper extremities muscle force were III grade . and the lower extremities muscle force were II grade .
肱二头肌反射