근육피부신경과 정중신경의 연결 및 임상적 의의

Abstract

The purpose of this study was to investigate variations in the communicating branch between the musculocutaneousand the median nerves and to discuss their clinical significance. Seventy two arms from 36 Korean adults were used.Twenty four cases (33.4%) among 72 arms had communications between the musculocutaneous and the mediannerves. In 19.5%, a communicating branch ran from the musculocutaneous to the median nerves and in 4.2% of these a communicating branch formed a loop. A branch running from the median to the musculocutaneous nerves wasobserved in 6.9%. There were more than two communicating branches between two nerves in 5.6%. The average anglebetween the musculocutaneous nerve proximal and distal to the coracobrachialis was 159±9at adduction of the arm.The musculocutaneous nerve did not pierce the coracobrachialis muscle in 2.8%. One case (1.4%) showed partial fusion of the trunks of the musculocutaneous and median nerves. The musculocutaneous nerve ran next to the median nerve after the coracobrachialis muscle and coursed laterally in 5.6% with or without a communicating branch. In these cases, the angle of the musculocutaneous nerve was more acute. The musculocutaneous nerve entrapment is discussed with this angle.