m 



UTErtOGESTATIOK 



FiiT. 520. 



Fig. 520.— DiAGRAJiMATic View of a Transverse Section op the Uterus at the 

 Sea'enth or Eighth Week of Pregnakcv. 



c, c, c', the cavity of tlie uterus wLich Ijocoraes tlie cavity of tlie deciJua, oiiening at 

 r, c, the cornua, into the Fallopian tubes, and at c', into the cavity of the cervix, which 

 is closed by a plug of luucus ; dr, decidua vera ; the tlat shade indicates the thickened 

 subepithelial structure, the radiated lines the glandular tubes between this and the 

 muscular wall ; (//•, decidua rcflexa with the sparser villi imbedded in its substance ; 

 (Is, decidua serotina, involving the more developed chorionic villi of the commencing 

 placenta, and forming also between these and the muscular wall a layer outside which the 

 glandular tubes are represented ; ch, chorion, with its villi; u, umbilical vessels of the 

 foetus passing into these, and in the umbilical cord ; aJ, remains of the allantoid 

 pedicle ; am, amnion ; i/, und.ilical vesicle ; v/', its duct, connected with /, the intestine 

 of the embrv-o. The placenta is shown as if it were situated at the fundus, but may be 

 supposed to be on the posterior wall of the uterus. 



