Coracobrachialis is one of the three muscles that attach to the coracoid process of the scapula. Left scapula - front view () Left scapula - rear view () In anatomy, the scapula, or shoulder blade, is the bone that connects the humerus (arm bone) with the clavicle (collar bone). ...
The other two muscles are the pectoralis minor and the biceps brachii. Location The pectoralis minor muscle takes its origin from the 3rd to 5th ribs, near their costal cartilages. ... A person flexing his biceps brachii In human anatomy, the biceps brachii is a muscle on the upper arm that acts to flex the elbow. ...
The coracobrachialis is generally pierced by the musculocutaneous nerve.
The flexion of the forearm (or the twitch of the muscle without movement) that follows tapping of the tendon of insertion of the biceps is known as the biceps reflex.
The musculocutaneous nerve supplies the biceps, coracobrachialis, brachialis, and elbow joint and terminates as the lateral antebrachial cutaneous nerve.
The musculocutaneous nerve arises from the lateral cord of the brachial plexus, opposite the lower border of the Pectoralis minor, its fibers being derived from the fifth, sixth, and seventh cervical nerves.
It pierces the Coracobrachialis muscle and passes obliquely between the Biceps brachii and the Brachialis, to the lateral side of the arm; a little above the elbow it pierces the deep fascia lateral to the tendon of the Biceps brachii and is continued into the forearm as the lateral antibrachial cutaneous nerve.
The branch to the Coracobrachialis is given off from the nerve close to its origin, and in some instances as a separate filament from the lateral cord of the plexus; it is derived from the seventh, cervical nerve.
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