Middle deltoid
Origin: Superior surface of the acromion process
Insertion: Deltoid tuberosity of humerus.
Action: Abduction of the humerus at the shoulder.
Synergists: Anterior and posterior deltoid as well as supraspinatus.
Middle deltoid
Origin: Superior surface of the acromion process
Insertion: Deltoid tuberosity of humerus.
Action: Abduction of the humerus at the shoulder.
Synergists: Anterior and posterior deltoid as well as supraspinatus.
