PECTORAL REGION 15 



lies in the superficial fascia, and its smooth contour is largely 

 due to the invasion of its substance by the fatty tissue of that 

 fascia. 



A little below its mid-point, and at a level which usually 

 corresponds to the fourth intercostal space, the mamma is 

 surmounted by a conical elevation termed the papilla mamma. 

 or nipple. The nipple stands in the middle of a circular 

 patch of coloured skin which is called the areola mamma. 



Teres major 

 Latissimus dorsi 



Pectoralis maj 

 Lobules of the gland 



Ampullae or sinuses of ducts 



Serratus anterior 



Fibrous trabeculae of the gland 



FIG. 7. Dissection of the Mamma. 



Within the nipple, and also subjacent to the areola, there is 

 no fat. A curious change of colour occurs in this region in 

 the female during the second month of pregnancy. At that 

 time the delicate pink colour of the skin of the nipple and 

 areola which was present in the virgin becomes converted to 

 brown, by the deposition of pigment, and it never again 

 resumes its original appearance. 



The mamma extends, in a horizontal direction, from 

 the side of the sternum almost to the mid-axillary line on 

 the side of the thorax, and, in a vertical direction, from 

 the second costal arch above to the sixth costal cartilage 



