European Journal of Biomedical and Pharmaceutical Sciences

VARIATION IN THE ATTACHMENT OF COSTOHUMERALIS MUSCLE

T. Ramesh Rao and Suresh R Rao*

ABSTRACT

New imaging techniques, such as computed tomography and magnetic resonance imaging, made easier the detection of the muscle variations of the upper limb. These variations are important in defining the anatomical features in relation to clinical diagnosis and surgical procedures. The knowledge of the anatomical variations in the axilla is important in surgical interventions, considering the frequency of procedures done in this region. We present a rare case of costohumeralis muscle, an accessory slip originating from the sixth rib near the costochondral junction and running along the lower border of the pectoralis major muscle and inserting onto the lateral lip of the intertubercular sulcus and medial epicondyle of the humerus on the right side. Clinical consideration of such a variation include ulnar nerve entrapment and functionally limited abduction of the humerus.

Keywords: costohumeralis muscle, pectoralis, costochondral.