An uncommon morphological variation of coracobrachial muscle

Abstract

The Coracobrachialis muscle in the arm is more important morphologically than functionally. In many animals, the Coracobrachialis has three parts. During the process of evolution the third part has disappeared and only the first two parts are found in man, enclosing the musculocutaneous nerve between them. Morphologic variations of Coracobrachialis have been known for a long time and include accessory slips that attach to the lesser tubercle, medial supracondylar ridge and medial intermuscular septum. The existence of abnormal insertion of the corabrachialis muscle should be kept in mind in a patient presenting with high median nerve palsy together with symptoms of brachial artery compression and before carrying out post-mastectomy reconstruction using coracobrachialis as a transposition flap.

Keywords

• coracobrachialis muscle
• two heads
• variation