10 



PHYSIOLOGY 



CHAP. 



The epithelial cells which form the specific substance of the 

 parathyroids are columnar or polyhedral in shape; they have a 



FIG. 4. Human thyroid and parathyroid glands. A, from behind ; B ami <_', from in front. 

 A 1, Superior "parathyroids ; A 2, inferior parathyroids : B 1 and C I, inferior parathyroids. 



small roundish nucleus which may exhibit karyokinesis. Accord- 

 ing to Vassale and General! the cytoplasm of the cells is sometimes 





lJ' 1 I \*>'K' *-" t 



FK;. "). Part of i-xternal parathyroid of last figure. (Kohn.) ??2. Shows epithelial cells arranjvd 

 in columns, with intervening septa of connective tissue ; m, m, cells in mitotic division. 



clear or finely granular and does not stain, sometimes it has coarse 

 stainable granules. In all probability these represent two different 

 stages of functional secretory activity. 



