ORIGIN OF THE CORPUS LUTEUM 



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Fig. 22 Cells of corpus luteum of pregnancy eighteen to twenty days old 

 (embryos of twenty-seven somites). Osmium tetroxide after formol fixation, 

 a, Diagram of a small portion of the periphery, showing a clump of theca cells 

 still present at the periphery at the site of a fold in the follicular wall, and in- 

 dicating by small rectangles the location of the cell groups in b and c. b, Cells 

 from persisting theca interna. X 1000. c, Cells from interior of corpus luteum, 

 showing two granulosa lutein cells and a third cell exactly resembling those of 

 the theca. X 1000. 



