20 



THE SUPERIOR EXTREMITY 



and from the shoulder by lymph vessels which accompany 

 the cephalic vein, and they transmit it to lymph vessels which 

 connect the delto- pectoral glands with the infraclavicular 

 glands (see Figs. 9, 30). 



M. Pectoralis Major. The powerful pectoralis major 

 muscle extends from the anterior aspect of the thorax to the 

 humerus. It is divided by a deep fissure into a clavicular and 



Cephalic vein 

 I Central axillary glands 

 ! / Delto-pectoral gland 

 ; ; ,! Infraclavicular glands 



Gland superficial to costo-coracoid membran 

 Interpectoral glands 

 / Lymph vessels passing to 

 i / ; sternal glands 



Lymph vessels from arm / 

 Lateral axillary glands 

 Posterior or subscapular axillary glands 

 Anterior or pectoral axillary glands 



Lymph vessels from deep parts of mamma 



passing to interpectoral, infraclavicular 



and also to supraclavicular glands 



Lymph vessels passing to join other lymph 

 vessels in extraperitoneal tissue 



FIG. 9. The Lymph Glands and Vessels of the Axilla and Mamma. 



a sternocostal portion. The fissure penetrates through the 

 entire thickness of the muscle, the clavicular and sternocostal 

 portions being distinct, except close to their insertions. The 

 clavicular portion arises by short tendinous and muscular fibres 

 from an impression on the medial half of the anterior surface 

 of the clavicle. The superficial part of the sternocostal portion 

 takes origin, by fleshy fibres, (i) from the anterior surface of 

 the sternum, (2) from the aponeurosis of the external oblique 

 muscle, and (3) occasionally from the sixth rib near its 



