- Shoulder (Front)
- Front Delts
- Anterior Deltoid (1 of 3)
- Clavicle (Anterior Lateral Third)
- Humerus (Lateral)
- Deltoid Tuberosity
The anterior deltoid is involved in the shoulder abducted when the shoulder is externally rotated. The anterior deltoid is only a weak synergist in strict transverse flexion, assisting the pectoralis major, but not transverse adduction, meaning the shoulder needs to be internally rotated to be recruited in the transverse plane.
Due to increasing moment arm with abduction, anterior deltoid is more effective at shoulder abductor in higher abduction angles in contrast to supraspinatus which is more effective shoulder abductor at lower abduction angles.