A treatise on the science and practice of midwifery / By W. S. Playfair.
- William Smoult Playfair
- Date:
- 1885
Licence: Public Domain Mark
Credit: A treatise on the science and practice of midwifery / By W. S. Playfair. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
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![into a granular mass, which from its supposed resemblance to a mulberry has been named the ')JMdfQJCI'Lk2^y- When the subdivision of the yelk is completed, its separate spheres become converted into cells, consisting of a fine membrane with granular contents. These cells unite by their edges to form a continuous membrane (Fig. 48), which, through the expansion of the muriform body by fluid which forms in its interior, is distended until it forms a lining to the zona pellucida. This is the hlasterdomic membrane, from which the foetus is developed. By this time~tHe ovum has reached the uterus; and before proceeding to con- sider the further changes which it undergoes, it will be well to study the alteration which the stimulus of impregnation has set on foot in the mucous membrane of the uteras, in order to prepare it for the reception and growth of its contents. Fig. 4S. Formation of the Blastodermic Membrane from the Cells of the Muriform Body. (After Joulin.) 1. Layer of alljumiiioub niatenal snnouiidlug 2. The zona pellucida. Changes in the Uterine Mucous Ifembrane consequent on Pregnancy.— —Even before the ovum reaches the uterus the mucous membrane be- comes thickened and vascular, so that its opposing surfaces entirely ^fi 11 the uterine cavity. These changes may be said to be the same in kind —aithough more marked and extensive in degree—as the alterations which take place in the mucous membrane in connection with each menstrual period. The result is the formation of a distinct membrane, which affords the ovum a safe anchorage and protection until its connec- tions Avith the uterus are more fully developed. After delivery, this membrane, Avhich is by that time quite altered in appearance, is at least partially thrown off with the ovum; on which account it has received the name of the decidiLa or caduca. Divisions of the Decidua.—The decidua consists of two principal ]X)r- tions, which in early pregnancy are separated from each other liy a con- siderable interspace. One of these, called the decidua vera, lines the entire uterine cavity, and is, no doul^t, the original mucous lining of the](https://iiif.wellcomecollection.org/image/b2121072x_0110.jp2/full/800%2C/0/default.jpg)
