Shoulder Joint Muscles (Origin/Insertion/Action)
Medial Deltoid (Action)
Abduction of the humerus
Supraspinatus (Action)
Abduction of the humerus and stabilization of the humeral head in the glenoid fossa
Pectoralis Major (Action)
Adduction, horizontal adduction, internal (medial) rotation, flexion of the humerus
Anterior Deltoid (Origin)
Anterior Lateral 3rd of the clavicle
Coracobrachialis (Origin)
Coracoid process of the scapula
Posterior Deltoid (Insertion)
Deltoid tuberosity of the lateral humerus
Anterior Deltoid (Insertion)
Deltoid tuberosity on the lateral humerus
Medial Deltoid (Insertion)
Deltoid tuberosity on the lateral humerus
Posterior Deltoid (Action)
Extension, horizontal abduction, external (lateral) rotation, abduction of the humerus
Latissimus Dorsi (Action)
Extension, internal (medial) rotation, adduction, horizontal abduction of the humerus
Teres Major (Action)
Extension, internal (medial) rotation, and adduction of the humerus
Infraspinatus (Action)
External (lateral) rotation, horizontal abduction, and extension of the humerus
Teres Minor (Action)
External (lateral) rotation, horizontal abduction, and extension of the humerus
Coracobrachialis (Action)
Flexion, adduction, and horizontal adduction of the humerus
Anterior Deltoid (Action)
Flexion, internal (medial) rotation, horizontal adduction of the humerus, and abduction of the humerus (a few fibers)
Infraspinatus (Insertion)
Greater tubercle of the humerus
Teres Minor (Insertion)
Greater tubercle of the humerus
Posterior Deltoid (Origin)
Inferior edge of the spine of the scapula
Infraspinatus (Origin)
Infraspinatus fossa of the scapula
Subscapularis (Action)
Internal (medial) rotation, adduction, and extension of the humerus
Medial Deltoid (Origin)
Lateral aspect of the acromion process
Pectoralis Major (Insertion)
Lateral lip of the bicipital groove of the humerus
Subscapularis (Insertion)
Lesser tubercle of the humerus
Pectoralis Major (Origin: Clavicular Head)
Medial 1/2 of the anterior surface of the clavicle
Supraspinatus (Origin)
Medial 2/3 of the supraspinatus fossa
Latissimus Dorsi (Origin)
Posterior crest of the ilium, back of sacrum, spinous process of lumbar and T7-T12 vertebrae, slips from lower 6 ribs
Teres Major (Origin)
Posteriorly on the inferior 3rd of lateral border of scapula
Pectoralis Major (Origin: Sternal Head)
Sternum and the cartilages of the upper 6 ribs
Subscapularis (Origin)
Subscapular fossa of the scapula
Supraspinatus (Insertion)
Superiorily on the greater tubercle of the humerus
Latissimus Dorsi (Insertion)
The bicipital groove of the humerus
Teres Major (Insertion)
The medial lip of the bicipital groove of the humerus
Coracobrachialis (Insertion)
The middle 3rd of the medial border of the humeral shaft
Teres Minor (Origin)
Upper 2/3 of the lateral border of the scapula
