THE FCETAL MKMBEANES OF MAN. 





! v ditlicult. l.ut occasionally it may >till be MOOD 1 li>hetl to 

 extent. 



Moreover in later months the inside of the decidua reflexa is 

 liniily tuse.l with tin- clioiion, ami >ince the chorion in its turn is in 

 with the ainnion (fig. 1-17 /// ai.d am), one i >u comes, by 



Fij. 148. Section through decidua terotina ( Dx at the transition into decidua vent (&r) and 



reflexa (Dr), afu-r KTSDHAT 

 .i/ Musculature of the uterus ; Sp, spongy layer >i i vera and serotina; C, & 



layer of the same ; glu, uterine glands ; sp, fissures in the serotina resulting from growth 



of the irlamls ; <lh. ampullarial spin v\'h of the giant's. 



iMittinjr through the muscular wall of the uterus, and then opening 

 the fretal membranes, which are thus pressed together, direct lv into 

 the amniotic cavity, in which the embryo lies bathed in the amniotic 

 fluid. 



(3) The third region of the uterine mucous membrane, or the 

 decidua serotina (fig. 148 Dse), is that part which joins with the 



17 



