

HYPOPHYSEAL MORPHOLOGY 



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Fig. 3.32. Election micrograph showmg a field of cells from the pars intermedia of the rat 

 pituitary. The plane of section passes through the nuclei (A^) of four of the cells, whereas 

 only the cytoplasm of several other cells is transected. The cell membranes (cm) stand out 

 prominently. 



These cells are seen to fit together like a mosaic, and they all show a similar appearance. 

 Their cytoplasm contains relatively few secretory granules (gr) and mitochondria (m). The 

 endoplasmic reticulum (er) is present in the form of tiny vesicular profiles with occasional 

 tubules. Elements of the Golgi complex (G) are visible in several areas. In these cells 

 the dense, paired Golgi membranes and granules predominate over Golgi vacuoles, which 

 are not seen at all in this field. X 9100. 



from that of the cells of the basophil class. 

 In the acidophil cells the Golgi apparatus 

 forms a net-like cap extending over one pole 

 of the nucleus, whereas in the basophil cells 

 it has the appearance of a spheroidal body 

 lying in the cytoplasm at some distance 

 from the nucleus. These characteristic dif- 

 ferences were confirmed by Foster (1947) 

 using the Sudan black staining method. 



Among the chromophobes some cells have 

 Golgi bodies similar to those of the granu- 

 lated acidophils, whereas in others they are 

 similar to those of the granulated basophils. 

 This suggests that the chromophobic cells 

 are not undifferentiated, rather that they 

 consist in part at least of temporarily non- 

 functioning but specifically differentiated 

 cells. 



