Chondroepitrochlearis muscle, a case report and a suggested revision of the current nomenclature

We present a rare case of an accessory muscular slip originating from pectoralis major and inserting onto the medial epicondyle of the humerus and the medial brachial intermuscular septum. According to the current nomenclature this muscle is defined as a chondroepitrochlearis; however, we propose a new nomenclature: thoracoepicondylaris. This term more accurately reflects the origin and insertion of this, and the few similar cases that have been reported in the literature. Clinical considerations of such a variation include ulnar nerve entrapment and functionally limited abduction of the humerus.