external image brachialis.jpg

Origin: Anterior lower half of humerus and medial and lateral intermuschular septa

Insertion: coronoid process of ulna

Actions: Unlike the biceps, the brachialis does not insert on the radius, and therefore cannot participate in pronation and supination of the forearm (it is the only "pure" flexor of the elbow).

Strengthen: Reverse preacher curls, one arm cable curls
Interesting/Fun Fact:
The brachialis (brachialis anticus) is a muscle in the upper arm that flexes the elbow joint. It lies deeper than the biceps brachii, and is a synergist that assists the biceps brachii in flexing at the elbow.