Additional muscle slips from the bicipital aponeurosis and a long communicating branch between the musculocutaneous and the median nerves

Kumar MR BHAT, Vinay KULAKARNI

Abstract

Additional muscle slips from the bicipital aponeurosis both to pronator teres and flexor carpi radialis muscles are uncommon and not been reported. Here, we report a case of presence of tendentious slip arising from the under surface of the bicipital aponeurosis in the cubital fossa in the left upper limb of a 72-year-old male cadaver. This tendineous slip was then divided into two separate muscular heads for the pronator teres and flexor carpi radialis muscles. Additionally, in the same cadaver we also found an unusual long communicating branch from the musculocutaneous nerve in the upper arm, which had long course through the arm before joining the median nerve in the cubital fossa. This report discusses the details of these variations, their clinical implication and embryological explanations.