12 



Anatomy, Pathology and Histology of the Mammary Gland. 



epithelial layer, separate themselves from the epithelial cells and 

 enter the alveoli, which at this stage contain fatty secretions, 

 leucocytes and epithelial cells in all stages of degeneration. 



With these manifestations the gland cell commences its 

 function. The desquamation of epithelial cells and the cell de- 

 generation disappear; the cellular infiltration of the connective 

 tissue recedes until it is very slight between the now greatly di- 



Fig. 7. 



2. 



Chronic mastitis of cow. 1 X 800. 



(a) Thickened interstitial tissue, (b) Alveoli, (c) Blood vessels. 



(1) Epithelial desquamation. (2) Colostra! bodies. (3) Cellular infiltration. 



(4) Fatty degeneration and necrosis. (5) Milk concrement. 



lated and distended glandular ducts. The cells are finely granular 

 on the basilar border, and at times show striation, that is, fine 

 streaks running in parallel directions (bioplasts according to 

 Altmann). 



The nucleus is large and vesicular in shape ; the upper part of 

 the cell is granulated and shows large and small fat globules. This 

 granulation and streaking may be seen, according to Steinhaus 

 and Duklert, at each act of secretion. The fine fat globules collect 



