608 



THE. HUMAN EMBEYO. 



small extent (Fig. 175). However, as the chorionic vesicle 

 with its contained embryo increases in size, the decidna reflexa 

 necessarily grows with it. This growth is at first more rapid than 



Fig. 255. — A pregnant Human Uterus of about the twenty-fifth day. The 

 uterus has been cut open longitudinally from the ventral surface; the 

 decidua reflexa has been out open, and the flap turned down to expose 

 the chorionic vesicle ; and the right ovary has been bisected to show the 

 large corpus luteum. The embryo that was taken from this chorionic 

 vesicle is shown in Fig. 199. (From Quain's ' Anatomy,' after Coste.) 



di; decidua reflexa. dv, decidua vera, o, cavity of tliif decidua reflexa, in wliicli the 

 chorionic vesicle is lying, u, uterus. 



