

Structure of Parathyroids 



19 



either clear or somewhat granular — others occur which are considerably 

 larger and contain oxyphil granules, staining with eosin (Welsh) : these only 







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Fig. 12. — Part of a section of thyroid and parathyroid (rat). Magnified 200 diameters. 

 In this gland the vesicles of the thyroid are distended with colloid ; the parathyroid 

 is of the reticular type. 



Fig. 13. — Section of an internal parathyroid (rat). Magnified 50 diameters. (An internal 

 parathyroid is rarely to be found in the rat, although common in many animals.) 

 The vesicles of the thyroid are empty of colloid in this preparation. 



appear after the tenth year in man. Probably they represent a functional 

 stage of the ordinary cells, since transitional forms occur. Both kinds of cell 



