Coracobrachialis - Musculus coracobrachialis
Origin: Coracoid process of scapula
Insertion: Medial humerus
Artery: Brachial artery
Nerve: Musculocutaneous nerve
Action: Flexes and adducts humerus
The Coracobrachialis, the smallest of the three muscles in this region, is situated at the upper and medial part of the arm. It arises from the apex of the coracoid process, in common with the short head of the Biceps brachii, and from the intermuscular septum between the two muscles; it is inserted by means of a flat tendon into an impression at the middle of the medial surface and border of the body of the humerus between the origins of the Triceps brachii and Brachialis. It is perforated by the musculocutaneous nerve.
Variations.—A bony head may reach the medial epicondyle; a short head more rarely found may insert into the lesser tubercle.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).