Muscle | Origin | Insertion | Action |
Pectoralis major | clavicle, sternum, cartilages of r's 1-6 | intertubercular groove of humerus | flexes, adducts, and rotates humerus medially |
Latissimus dorsi | SP's of lumbar and inferior thoracic vertebrae, iliac crest & R's 9-12 | intertubercular groove of humerus | extends, adducts, & rotates humerus medially |
Deltoid | clavicle, acromion process. spine of scapula | deltoid tuberosity of humerus | abducts, extends, and flexes humerus |
Supraspinatus | supraspinous fossa of scapula | greater tubercle of humerus | abducts humerus |
Infraspinatus | infraspinous fossa of scapula | greater tubercle of humerus | rotates humerus laterally |
Teres major | inferior angle & lateral border of scapula | intertubercular groove of humerus | extends, adducts & rotates humerus medially |
Teres minor | lateral border of scapula | gr. tubercle of humerus | rotates humerus laterally |
subscapularis | subscapular fossa | lesser tubercle of humerus | rotates humerus medially |
Coracobrachialis | coracoid process of scapula | medial shaft of the humerus | flexes and adducts humerus |