The brachialis is the deepest muscle of the three muscles within the anterior compartment of the arm. The other muscles are the biceps brachii and the coracobrachialis.

Origin
Anterior surface of the distal half of the humerus
Insertion
Tuberosity and coronoid process of the ulna
Innervation
Musculocutaneous nerve (C5-C6) and radial nerve (C7)
Blood Supply
Brachial artery
Radial recurrent artery
ActionFlexion of the forearm at the elbow joint.