262 



Muscles of the Chest. 



M. trapezius 



M. biceps 

 biaehii 

 (caput 

 breve) 



M. biceps 



brachii 



(caput 



longuui) 



M. triceps 



brachii 



(caput 



hiteralc) 



Fossa infraclavienlaris 



Clavicula 

 Acromion 



M. deltoideus 



M. 



sternocleido- 

 niastoldeus 



M. pectoralis 

 major (pars 

 elaviiularis) 



+ Sternum 



M. pectoral 



major 

 (pars stern 

 costal is 



M. pectora 

 major (pa: 

 abdominal 



Vagina 



m. recti 



abdominis 



M. latissimus dorsi i 



M. serratus anterior 



M. obliquus externus abdominis 



308. Muscles of the right side of the chest, 



viewed from in front. 

 (The platysma has been removed.) 



M. pectoralis major (see also Figs. 309, Slfi, 317 and 343). Form: flat, quadrangular, 

 hniad, thick. Position: on each side it passes out from the median plane to the anterior 

 surface of the thorax and of the axilla, above it is partly covered by the platysma. Origin: 

 medial half of the clavicle (pars clavicidaris) , anterior surface of the sternum, and of the 

 second to the seventh costal cartilage (pais sternocostalis) and the anterior leaf of the vagina 

 m. recti abdominis (pars ahdominalis) . Insertion: see p. 263. 



