THE THYREOID AXI) PARATHYREOID 



411 



291); in the latter case colloid niay be present in the lumen. Colloid 

 has also been found between, and colloid and glycogen within, the cells. 

 The cells themselves are spheroidal, cuboidal or pyramidal, with 

 basal nuclei. The appearance of the cells varies sufficiently to have 

 caused two or three types to be distinguished. All, however, probably 

 represent different functional conditions of the same cell, (i) CJiieJ 

 or clear cells {Fig. 2Sg). These are the more numerous. Their bodies are 

 small and clear, and the cytoplasm does not stain readily. The nuclei 



Fig. 290. — Section of Human Parathyreoid showing groups of oxyphile cells. (Pool.) 



are large in proportion to the cell and are clear and vesicular with 

 loosely arranged pale chromatin network. (2) Oxyphile cells (Fig. 

 290). These are larger, their cytoplasm is more granular and takes 

 a strong eosin stain. The nucleus is small, its chromatin network 

 closely arranged and takes a dark stain. Compact groups of these 

 cells occur especially just beneath the capsule. They are also found 

 throughout the gland, arranged as cords, as single cells, or as small 

 groups among the clear cells. Intermediate types have been de- 



