CALCIFEROUS GLANDS 



33 



sumably removes protein and other high molecular weight 

 compounds, the fluid enters the lumen of the gland. The cells then 

 actively take up water and certain salts via the brush border and 



o o 



Fig. 11. Cytology of calciferous cells, (a) (a') from posterior 

 region. Altmann-Fuchsin stain showing batonnets and several types 

 of mitochondria. Alkaline phosphatases (black), esterases (hatched 

 areas), (b) (b') cells of calciferous area with spheroliths abundant in 

 the cells, (c) Mucus cells. Black circles show polysaccharide 

 inclusions (from van Gansen, 1959). 



alkaUne phosphatase system. As a result the contents of the lumen 

 are concentrated and calcium carbonate eventually precipitates 

 out (Fig. 12). 



By the time the blood reaches the mid and anterior portions of 



