The chondroepitrochlearis muscle.
The chondroepitrochlearis is a rare muscle anomaly of the pectoral region in the human. The anomaly is an abnormal musculotendinous unit that is found to originate from the pectoralis major and inserts onto the medial epicondyle of the humerus. This muscle, at times, can be associated with the muscular arch of the axilla and can not be mistaken for the rare coracobrachialis longus. The authors are reporting a 2-week-old infant of normal gestational age with this exceedingly rare anomaly and the only known reported successful surgical release of this muscle with return to normal functional status and cosmetic improvement.
D006801:Humans; D007231:Infant, Newborn; D008297:Male; D010369:Pectoralis Muscles / Q000002:abnormalities* / Q000601:surgery