Structure of the Tissue. 



13 



into larger ones, which are only separated from the lumen by fine 

 protoplasm, or having been expelled have already entered the al- 

 veoli. With the collection of the secretion these dilate, the cell 

 becomes flattened during the expulsion of its products, and the part 

 lying towards the lumen appears indistinctly bordered as if 

 shredded after the expulsion of the fat. They soon become smooth 

 again, and by the pressure of the alveolar contents and the dilation 



a 



Chronic mastitis of cow. 1 X 90. 

 (a) Healthy portion, (b) Glandular portion with chronic mastitis. 



of the alveoli, the cells sink and become so flat that the nuclei not 

 infrequently appear bulged out towards the lumen. After the 

 expulsion of the secretion the formation of additional secretion 

 again commences in the cell, the protoplasm again becomes cloudy 

 and granular, and so on, a continuous change of the form of the 

 cell taking place. 



During the entire lactation period, but more so in the later 

 stages, manifestations of atrophy of the gland appear, at first 



