The musculocutaneous nerve (MCN) is well-known for perforating the coracobrachial is. It is also known to pierce the short head of the biceps and brach iali s on occasion. Recent comprehensive summaries of human anatomic vari ation, however, have not reported the MCN perforating a sup ernu merary biceps head. We rep ort a case of the MCN perforating a third, in fero-medi al head of the biceps brachii and then continuing as the lateral antebrachial cutaneous nerve (LACN) in an 82 year-old Cauca si an fe male ca dave r. We propose that this case and simi lar re ce ntly reporte d cases indicate the necessity of including this variation in any future, formal summaries and cl assifications of MCN variation . Its anatomical signi ficance, as well as its potential as a possible etiology in the clinical assessment of MCN and LACN compression syndromes is also discussed
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