AN ANOMALOUS MUSCLE IN THE DISTAL HALF OF THE ARM

During dissection an anomalous muscle was found on the medial aspect i n the distal half of one left upper extremity. This muscle arose from the humerus between the m. coracobrachialis and the m. brachialis, pas sed obliquely across the front of the brachial artery and median nerve and blended with the common origin of the forearm flexor muscles. It does not appear to be an additional head of the biceps brachii or the brachialis muscles. The existance of this anomalous muscle should be k ept in mind in a patient presenting with a high median nerve palsy tog ether with symptoms of brachial artery compression.