- Arm (Side)
- Lower Biceps
- Humerus (Anterior)
- Coronoid Process
The brachialis muscle belly is located towards distal half of arm and is largely covered by biceps brachii.
The brachialis flexes arm along with other elbow flexor muscles, whether in pronation or supination. It is the only pure elbow flexor since it pulls on the ulna which does not rotate. (Thompson & Floyd 1994)
At the initiation of elbow flexion, the brachialis is highly activated since its line of pull is more perpendicular to the ulna as compared to the biceps' insertion to the radius.