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Coracobrachialis muscle

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Origin, insertion, innervation and functions of the coracobrachialis muscle.

The coracobrachialis is a long and slender muscle of the anterior compartment of the arm. As its name suggests, it extends from the coracoid process of scapula to the shaft of the humerus

The main function of the coracobrachialis muscle is to produce flexion and adduction of the arm at the shoulder joint. Along with the other flexors of the arm (biceps brachii and brachialis muscles), coracobrachialis is innervated by the musculocutaneous nerve.

In this article, we will discuss the anatomy and function of the coracobrachialis muscle.

Key facts about the coracobrachialis muscle
Origin Coracoid process of the scapula
Insertion Anteromedial surface of the humerual shaft
Action Adduction and flexion of the arm at the shoulder joint
Innervation Musculocutaneous nerve (C5- C7)
Blood supply Muscular branches of brachial artery
  1. Origin and insertion
  2. Relations 
  3. Innervation
  4. Blood supply
  5. Function
  6. Clinical relations
  7. Sources
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Origin and insertion

The coracobrachialis is a slender muscle that originates from the deep surface of the coracoid process of scapula.

The muscle fibers run inferolaterally towards the humerus. They insert onto the anteromedial surface of the humeral shaft, between the brachialis muscle and the medial head of triceps


The coracobrachialis muscle lies posterior to the pectoralis major muscle and anterior to the tendons of subscapularis, latissimus dorsi, teres major and the medial head of triceps. The muscle is located medial to the biceps brachii and brachialis muscles. The humeral insertion of coracobrachialis is crossed anteriorly by the median nerve. Along with the humerus, coracobrachialis forms the lateral border of the axilla, where it is also the easiest to palpate the muscle.

Feeling overwhelmed by so many muscles and their attachments? Get yourself a copy of our muscle anatomy reference charts to learn the muscle key facts faster!

Learn everything about the anatomy of the shoulder muscles with our study unit.


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

Blood supply

The coracobrachialis muscle receives its blood supply by the muscular branches of brachial artery. The additional supply comes from the anterior circumflex humeral and thoracoacromial arteries.


The main actions of the coracobrachialis muscle are bending the arm (flexion) and pulling the arm towards the trunk (adduction) at the shoulder joint. When the arm is abducted and extended, the coracobrachialis muscle acts as a strong antagonist to the deltoid muscle.

Feeling ready to test your knowledge on the muscles of the arm and shoulder? Try out our quiz below:

Coracobrachialis muscle: want to learn more about it?

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