DISSECTION OF THE UPPER EXTREMITY 57 



Mammary Gland (Mamma). (Fig. 10.) 



Compare the gland in your subject with one from a subject 

 of the opposite sex. If the breast is well developed, dissect the 

 gland under water and make out 



(a) Lobes of breast (lobi mammae). 



(aa) Lobules of breast (lobuli mammae). 



(b) Milk-ducts (ductus lactiferi). 



(ba) Milk-sinuses or ampullae (sinus lactiferi). 



FIG. 10. 



Medial margin 

 Fascia pectoralis- - 

 M. pectoralis major ^ 

 Pannicidus adiposus,^ 

 Integument um commune,- 

 Lobuli mammae >; 

 Lobi mammae's;-' 



Papilla mammae^ 



Ductus lactiferi 



Sinus lactiferi 



Corpus mammae 



Lateral margin 

 Horizontal cut through the female breast. (After Toldt, Anat. Atlas, Wien, 1900, 2 Aufl., p. 501, Fig. 860.) 



Review the blood-supply of the mamma. Study illustrations 

 of the lymphatic channels leading from the breast to the pectoral 

 lymph-glands (lymphoglandulae pectorales), the axillary lymph- 

 glands (lymphoglandulae axillares), and the sternal lymph- 

 glands (lymphoglandulae sternales). (Cf. Figs. 15, 86, and 93.) 

 Note that where the breasts are very large the lymphatic chan- 

 nels of one breast may communicate with those of the breast of 

 the opposite side across the median line. 



Fascia Pectoralis or Deep Fascia. 



Note its relations above, below, medialward, and lateralward, 

 a.nd the process from it to the fascia coracoclavicularis in the 

 fossa infraclavicularis. 



