94 ELEMENTS OF MAMMALIAN ANATOMY 



deep layer from the ventral surface of manuljriuni and sternum; 

 both layers insert onto shaft of humerus. 



(15) Pectoralis minor (Fig. 48) (Entopectoralis) ; sternum to 

 shaft of humerus. 



(16) Xiphihumeralis (Fig. 48); Xiphoid process of sternum 

 to humerus. The pectoralis group of muscles draws the arm 

 mediad. 



MUSCLES ON THE OUTER SURFACE OF THE SCAPULA 



(17) Spinodeltoideus (Fig. 54) ; scapular spine to deltoid ridge 

 on humerus; flexor and rotator of humerus. 



(18) Acromiodeltoideus (Fig. 54) ; acromion and metacromion 

 to humerus and on spinodeltoideus; flexor and rotator of 

 humerus. 



(19) Clavobrachialis (Fig. 54); clavicle and raphe adjacent, 

 to ulna; continuation of clavo trapezius; flexor of antibrachium. 



(20) Supraspinatus (Fig. 55); supraspinatus fossa to greater 

 tuberosity of humerus; extensor of humerus. 



(21) Infraspinatus (Fig. 55); infraspinatus fossa to greater 

 tuberosity of humerus; rotator of humerus. 



(22) Teres minor; glenoid border of scapula to proximal 

 end of humerus; rotator of humerus. Best studied after 

 removal of teres major, later. 



MUSCLES ON THE INNER SURFACE OF SCAPULA 



(23) Subscapularis (Fig. 48); subscapular fossa to lesser 

 tuberosity of humerus; pulls humerus mediad. 



(24) Teres major (Fig. 56); glenoid border of scapula and 

 fascia with latissimus dorsi on humerus; rotator and flexor of 

 humerus. 



(25) Coracobrachialis (Fig. 56); coracoid process to proximal 

 end of humerus; adductor of humerus. 



MUSCLES OF THE UPPER ARM (BRACHIUM) 



(26) Epitrochlearis (extensor antibrachii longus) ; latissimus 

 dorsi to olecranon process of ulna; extensor of arm and supina- 

 tor of hand. 



