Unilateral occurrence of a chondroepitrochlearis muscle.

An abnormal muscle slip was encountered during routine dissection studies of a male cadaver. According to its origin, attachment and innervation, the abnormal slip was identified a chondroepitrochlearis muscle. Arterial and nervous supply were from the lateral thoracic artery and the medial pectoral nerve, respectively. Furthermore, no axillary arch muscle was observed. In addition, an abnormality in the attachment of the pectoralis major muscle was observed. Copyright 2004 Wiley-Liss, Inc.