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Brachialis

The brachialis (also brachialis muscle, Casserio`s muscle, latin: musculus brachialis) is a thick muscle of the upper arm located in the anterior region under the biceps brachii.

Origin

The brachialis originates from the anterior surface of the lower part of the humerus.

Insertion

The brachialis inserts onto the tuberosity of the ulna.

Action

The main function of the brachialis is flexion of the forearm.

Innervation

The brachialis is innervated by the musculocutaneous nerve.