Muscles of arm

The muscles of arm are grouped into two compartments: the anterior compartment and the posterior compartment.

Anterior Compartment

The anterior compartment of the arm contains three muscles:

• Coracobrachialis

• Biceps brachii

• Brachialis

These muscles are primarily involved in flexion at the elbow and shoulder joints.

Posterior Compartment

The posterior compartment of the arm contains a single muscle: Triceps brachii. An additional muscle called the anconeus is considered to be a part of the triceps brachii. The triceps brachii has three heads:

• Medial head

• Lateral head

• Long head

This muscle is primarily responsible for the extension of the elbow joint.