Innervation anomalies in upper and lower extremities (an electrophysiological study).

A hundred and eight subjects were studied for the frequent occurrence innervation anomalies in upper and lower extremities. Martin-Gruber Anomalies (MGA) were found in 19 (17.5%) subjects. The anomaly was bilateral in 14 subjects (73.6%). No case of motor ulnar to median nerve anastomosis in the forearm could be found. The 73.1, 20.8 and 14.3% incidences of the neural communication between the ulnar and median nerves in the hand were detected, in the Abductor Pollicis Brevis (APB), in the First Dorsal Interosseus (FDI) and in the Abductor Digiti Minimi (ADM) muscles, respectively. The existence of an accessory deep peroneal nerve was found in 23 (21.3%) subjects and 40 (18.5%) of legs. The anomaly was bilateral in 17 subjects (74%). We observed both MGA and accessory deep peroneal nerve in 9 cases.