An accessory branch of musculocutaneous nerve joining median nerve

We observed an accessory branch of the musculocutaneous nerve. This variation has clinical importance in median nerve lesions and its distinctive diagnosis. The coracobrachialis muscle is usually supplied by the musculocutaneous nerve. Its innervation pattern exhibits a considerable variation [1]. The change in the innervation of the coracobrachialis muscle is reported to be closely correlated with the change of course of the musculocutaneous nerve [2, 3]. The musculocutaneous nerve usually arises from the lateral cord of the brachial plexus, pierces and innervates the coracobrachialis muscle [2, 4]. However, the course and branching anomalies of the musculocutaneous nerve and its relation to the coracobrachialis muscle have been documented in the literature by Koizumi [2], Buch [5], Flatow et al. [6], and Le Minor [7]. On the other hand, the distribution, course and branching of the musculocutaneous nerve is important from the clinical point of view, especially in compression neuropathies due to vigorous activity and stretch injuries seen in various surgical interventions [8–10].