MUSCLE | ORIGIN | INSERTION | ACTION |
Posterior Deltoid | spine of scapula | Deltoid tuberosity | Shoulder abduction, extension, lateral rotation, horizontal abduction |
Supraspinatus | Supraspinous fossa | greater tubercle of humerus | shoulder abduction |
Pectoralis Major (Clavicular Portion) | Medial 1/3 of clavicle | lateral lip of bicipital groove of humerus | shoulder flexion (first 60 degrees) |
Pectoralis Major (Sternal Portion) | Sternum, costal cartilage of first six ribs | Later lip of bicipital groove | Shoulder extension (first 60 degrees)*180-120 |
Pectoralis major All Portions | | | Shoulder adduction, medial rotation, horizontal adduction |
Latissimus Dorsi | Spinous Process of T7-L5, thoracolumbar fascia, post. surface of sacrum, iliac crest, and lower three ribs | Medial lip of bicipital groove | Shoulder extension, adduction, medial rotation, hyperextension |
Teres Major | Axillar border of scapula near inferior angle | Crest below lesser tubercle next to latissimus dorsi attachment | Shoulder extension, adduction, medial rotatoin |
Infraspinatus | Infraspinous Fossa | Greater tubercle | Shoulder lateral rotation, horizontal abduction |
Teres Minor | Axillary border of scapula | greater tubercle | shoulder lateral rotation, horizontal abduction |
Subscapularis | subscapular fossa | lesser tubercle | shoulder medial rotation |
Corachobrachialis | coracoid process | medial surface of humerus near midpoint | stabilizes the shoulder joint |
Anterior Deltoid | Lateral 1/3 of clavicle | Deltoid tuberosity | Shoulder abduction, flexion, medial rotation, horizontal adduction |
Middle Deltoid | Acromion Process | Deltoid tuberosity | shoulder abduction |