Also called: coracobrachialis muscle
The coracobrachialis is a slender muscle in the upper medial arm. It arises from the tip of the coracoid process of the scapula and inserts on the middle third of the medial humerus. The musculocutaneous nerve pierces and supplies it, and it flexes and adducts the arm at the shoulder.
| Origin | Tip of the coracoid process of the scapula (with the short head of biceps). |
|---|---|
| Insertion | Middle third of the medial surface of the humeral shaft. |
| Innervation | Musculocutaneous nerve (C5-C7). |
| Blood supply | Muscular branches of the brachial artery. |
| Action | Flexes and adducts the arm at the shoulder; helps resist dislocation of the humeral head. |
3D model: BodyParts3D (CC BY 4.0), adult male reference anatomy. Highlighted structure shown with nearby bones for context.
The coracobrachialis forms a landmark in the axilla and upper arm: the musculocutaneous nerve pierces the muscle and the brachial artery runs along its medial border.
Its tendon of origin fuses with the short head of the biceps brachii.
The musculocutaneous nerve pierces the muscle and supplies it.
It flexes and adducts the arm at the shoulder joint.
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