322 Kojima 



size (5yu), contain fine chromatin granules and are distinctly stained by 

 hajmatoxylin. The cytoplasm of these cells is coloured red by Mallory 

 (acid fuchsin), while their nuclei and the cytoplasm of the other cells of 

 the gland are stained blue by this reagent. The other cells of the pars 

 anterior are the basiphil cells and the principal or chromaphobe cells. 

 The basiphils are fewer in number than the oxyphils, varying in size 

 and in shape, some being much larger than the oxyphil cells. Their 

 cytoplasm is less dense ; it contains fine granules which stain faintl}" with 

 basic dyes. The nuclei resemble those of the oxyphils. The so-called 

 principal or chromaphobe cells occur in far greater number than the 







m- 



e^ 



V 



4* 



^ > •>'. "' "* 



ifc ^ % 



o"'' 







- ^^^ 



fV^^ 







L. 





Fig. 1. — Section of jiars anterior of pituitary body of male rat. ilicrophotograph ; 

 magnified 500 diameters. Hsematoxj'lin-eosin preparation. 



The cells which in the figure are a little darker than the rest are oxyphil cells. 

 Several blood-vessels filled with blood-corpuscles are seen in the section. 



oxyphils and basiphils. The cytoplasm is only faintly stained by haema- 

 toxylin. The nuclei varj^ in diameter from 5/u. to 5'5/^. Vesicles of various 

 size encircled by these cells are fairly frequent : some of the vesicles contain 

 hyaline substance ; others appear empty. 



The pars intermedia is thickest opposite the middle of tlie cleft. Its 

 cells are relatively small ; their cytoplasm is finely granular and stains 

 faintly with hsematoxylin. The nuclei, which vary in size, are of much 

 the same diameter as those of the principal cells of the pars anterior 

 (ofx to 5-5/x). A few small vesicles encircled by epithelium cells are 

 occasionally to be seen embedded in the pars intermedia. 



The pars nervosa has the appearance of a reticulum of fibres containing 

 neuroglia-cells, with droplets of hyaline substance interspersed liere and there. 



