THE MAMMA. 



15 



principally in the axillary and internal mammary trunks ; but others enter an( j veins, 

 the intercostal veins. 



The nerves are supplied from the anterior and lateral cutaneous branches Xerves. 

 of the thorax, viz., from the third, fourth, and fifth intercostal nerves. 



The lymphatics of the inner side open into the sternal glands ; those of Lymphatic.- 

 the outer side pass to the axillary glands. 



FIG. 4. VIEW OF THE DISSECTED AXILLA (ILLUSTRATIONS OF DISSECTIONS). 



Muscles : 



A. Pectoralis major. 



B. Pectoralis minor, 

 c. Serratus magnus. 



D. Latissimus dorsi. 



E. Teres major. 



F. Subscapularis. 



G. Coraco-brachialis. 

 H. Biceps. 



Vessels : 



a. Axillary artery. 



b. Axillary vein. 



c. Subscapular vein. 



d. Subscapular artery. 



e. Posterior circumflex artery. 



Serves: 



1. Median. 



2. Internal cutaneous. 



3. Ulnar. 



4. Musculo-spiral. 



5. Nerve of Wrisberg. 



6. Internal cutaneous of musculo- 



spiral. 



7. Intercosto-hurneral. 



branches of lateral 

 cutaneous of the 

 thorax. 



8. Posterior 



9. Anterior 



Dissection (fig. 4). With the limb drawn outwards (abducted) Dissection 

 from the trunk, the student should now remove the fascia and the 

 fat from the surface of the great pectoral muscle. In cleaning the 

 muscle the scalpel should be carried in the direction of the fibres, 

 viz. from the arm to the thorax ; and the dissection may be begun 



