Chondrohumeralis and axillary arch of Langer: a rare combination of variant muscles with unique insertion.

During routine dissection, we found a rare case of an aberrant muscular slip originating from the pectoralis major called as the "chondroepitrochlearis / thoracoepicondylaris / costohumeralis" and an anomalous slip from the latissimus dorsi called as "axillary arch of Langer / musculus dorsoepitrochlearis" in the same axilla. Interestingly, these two slips found to have a common insertion after arching superficial to the axillary neurovascular bundle, into the fascia covering the biceps brachi and to the lateral lip of the intertubercular sulcus of the humerus. Presence of combination of these two rare variant muscles and their unique insertion pattern has not been reported earlier. The knowledge of these muscle variations is important for the clinicians and physiotherapist for better diagnosis and treatment. Here in this report, in addition to the case presentation, we also discuss their clinical significance and the review of literature in detail.