78 



THE MUSCLES. 



48. M. tran-nerzo-seapnlaris tertiits s. serratits (Ecker), (Fig 1 . 

 68 fo"). 



This is larger than the muscle just described ; arising by a 

 broad and flat origin from the transverse processes of third and fourth 

 vertebrae, it runs upwards and inwards to be inserted into the 

 ventral surface of the cartilaginous scapula near its inner border. 

 In position, course, and action the muscle most nearly represents the 

 m. serratits anticns of human anatomy. 



(II.) Muscles on the scapula, that is, arising from the scapula 

 and inserted into the scapula or humerus. 



(a) Muscles on the deeper surface. 



Fig. 69. 



t.r. 



Muscles of right shoulder and upper arm. The cora- 

 ooids (co) and the clavicles (el) have been drawn 

 apart after cutting through the sternum. 



c.h. M. coraco-humeralis. 



el Clavicle. 



t.o. Coracoid. 



d M. deltoid eus. 



d' Clavicular j>ortion of m. deltoideus. 



f M. infraspinatus. 



i.s. M. interscapularis. 



l.a. M. levator anguli scapulae. 



l.d. M. latissimus dorsi. 



;/ Sternal portion of m. deltoideus. 



//' Anterior sternal portion of the m. pectoralis. 



f!" Posterior sternal portion of the m. pector.ilis. 



x Scapula. 



t.r. M. sternoradialis. 



t.r. M. triceps brachii. 



49. M. interscapvlaris 

 (Fig. 69 i.s.}. 



Duges, interscapulaire, n. 64. 



One end of this muscle is 

 tendinous, and is attached to 

 the outer extremity of the su- 

 prascapula ; from this the 

 muscle, becoming fleshy and 

 narrower, runs towards the 

 middle line to become at- 

 tached to the ridge on the 

 ventral surface of the scap- 

 ula, from which the m. del- 

 toideus and the m. sulscapularis 

 arise, and between which it 

 passes. It approximates the 

 scapula and suprascapula and 

 lessens the angle between 

 them. 



50. M. snbscapularis (Fig. 

 70 ?<?). 



Duges, sous-scapulo humeral, 

 n. 72. 



This muscle is situated on 



