FCETAL NUTRITION: THE PLACENTA 



461 



body in an age-series of pregnant rabbits from the fourteenth day 

 to the end of pregnancy. The maternal placenta was separated 

 mechanically from the fo3tal placenta, and each was investigated 

 separately. The maternal part includes the two glycogenic areas. 



ir. 



rs 



Uto "^ 



-SS 



m. 



FIG. 131. Glycogenic areas of the rabbit's placenta at the twelfth day of 

 pregnancy. (Chipinan.) 



fp, Fretal placenta, containing no glycogen ; i>; intermediary region ; rs, 

 region of uterine sinuses ; ss, uterine sinuses with perivascular sheaths 

 of uninucleate cells rich in glycogen ; r, glycogen granules in multi- 

 nucleate cells ; m, muscular wall immediately above which, at a later 

 date, the zone of separation, containing glycogenic decidual cells, is 

 differentiated. 



the region of the uterine sinuses and the zone of separation. The 

 foetal part includes the peninsula' of decidual tissue which form the 

 intermediary zone; the glycogen contained in it belongs wholly to 

 these peninsulas and represents the fraction most intimately related 

 to the trophoblast. It may on that* account be termed the proximal 

 glycogen, while that of the maternal part is the distal glycogen. On 



