Anterior Deltoid
Origin: Anterosuperior border of the lateral 1/3 of the clavicle.
Insertion: Deltoid tuberosity of humerus on the anterolateral surface just above the midshaft.
Action: Abduction, horizontal flexion and medial rotation of the humerus at the shoulder.
Synergists: Â Middle and posterior deltoid, supraspinatus and pectoralis major clavicular division.
