Anomalous insertional slip of latissimus dorsi muscle: arcus axillaris.

An anomalous muscular slip arising from the latissimus dorsi m. was encountered on the right side of a male cadaver during a dissection in our laboratory. The slip left the muscular part of the latissimus dorsi 8 cm distal to its insertion, coursed superolaterally anterior to the neurovascular structures and was inserted into the coracobrachialis fascia. The morphology of the additional slip and its possible clinical implications are discussed.