864 



SPERM, OVA, AND PREGNANCY 



'^^^^^^^0-^^^^^-' 



INNER CEUL MASS 





X 

 ^ 



# ^- - - ^5#^- ^ '.>4-%^- i 



lis ©• 



Fic. 14.24. The (•.-Illy M.-itic of attacliiucnt of the O-day maca.iuc M im.hxm The .Miihryonic 

 pole is directed towards the uterine epithelium (Wislocki and Streeter, 1938). 



:^^M- 





Fig. 14.25. A section through an implanting rabbit blastocyst showing an unusually narrow 

 trophoblast invasion of the uterine epithelium. There is no evidence of epithelial debris 

 within the trophoblast cells. A group of clumped uterine epithelial nuclei surrounded by pale 

 cytoplasm lies to the left of the invading foot (Boving, 1959a). Fixation: Sousa, Azan stain. 

 X600. 



