Rotunda midwifery for nurses and midwives / by G.T. Wrench.

  • Guy T. Wrench
Date:
1908
Catalogue details

Licence: In copyright

Credit: Rotunda midwifery for nurses and midwives / by G.T. Wrench. Source: Wellcome Collection.

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    a bottle containing certain dissolved substances necessary to the plant’s life. The rootlets take these substances from the water and so the plant is fed, flourishes and grows. Much the' same thing happens to the ovum. The chorionic villi dip and burrow into the spongy decidua and take from the mother’s blood, that soaks and circulates through the decidua, the dissolved substances needed for the life of the embryo. They also give up to the decidual blood the waste substances of the foetus. For the first three lunar-months of pregnancy the greater part of the ovum is covered with these chorionic villi. The Placenta {Plakoros—Greek, a flat cake).—After the third month, most of the chorionic villi wither and dis- appear. Over a hmited area, however, they continue to grow vigorously and form the placenta. The placenta then is an organ composed of (1) chorionic villi ; (2) maternal decidua. The spongy decidua becomes honeycombed Avith large spaces and channels full of blood, the so-called venous sinuses (sinus—Latin, a bay, a gulf). Into these channels the wavy tufts of the chorionic villi with their blood- vessels dip, very much as the rootlets of the plant dip
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