Coracobrachialis

The coracobrachialis (Latin: musculus coracobrachialis) is a slender, flat muscle of the upper limb. It is located in the anterior compartment of the upper arm together with the biceps brachii and brachialis muscles. The coracobrachialis stretches between the scapula and humerus. This muscle is one of the arm flexors.

Origin

The coracobrachialis muscle originates from the coracoid process of the scapula.

Insertion

The coracobrachialis inserts on the anteromedial surface of the humeral body.

Action

The coracobrachialis muscle provides flexion, adduction and internal (medial) rotation of the arm at the shoulder joint.

Innervation

The coracobrachialis is innervated by the musculocutaneous nerve (C5 - C7) that is a branch of the brachial plexus.

Blood supply

The coracobrachialis muscle primarily receives arterial blood supply from the muscular branches of the brachial artery. It is also supplied by the anterior humeral circumflex and thoracoacromial arteries. Both are branches of the axillary artery.