. The science and art of midwifery . 54 PHYSIOLOGY OF THE OVUM. b. Fig. r, Formation of decidua completed, a, decidua re-flexa : b, decidua vera ; c, decidua serotiua. tinguished as the decidua strut inn. It is physiologically important asthe site of the placenta. The ovum is not simply adherent. It lies, as it were, imbedded inthe tumefied membrane, folds of which grow up around it, and finally meel so as to inclosec it in a cavity of its own, shut off from thegeneral cavity of theuterus.* The folds of mucousmembrane which inclosethe ovum are termedthe decidua reflexa. The space betweenthe de
. The science and art of midwifery . 54 PHYSIOLOGY OF THE OVUM. b. Fig. r, Formation of decidua completed, a, decidua re-flexa : b, decidua vera ; c, decidua serotiua. tinguished as the decidua strut inn. It is physiologically important asthe site of the placenta. The ovum is not simply adherent. It lies, as it were, imbedded inthe tumefied membrane, folds of which grow up around it, and finally meel so as to inclosec it in a cavity of its own, shut off from thegeneral cavity of theuterus.* The folds of mucousmembrane which inclosethe ovum are termedthe decidua reflexa. The space betweenthe decidua vera and re-flexa is tilled by opaque,viscid Placenta —The villi which cover the chorion become imbeddedin the soft tissues of the decidua, and derive, by absorption, nutritivematerials from the circulatory system of the mother. After the for-mation of the permanent chorion, by the extension of the allantois tothe inner surface of the egg, the allantoic vessels convey the absorbedmaterials directly to the embryo. At first, absorption takes plac
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