The practice of obstetrics, designed for the use of students and practitioners of medicine . It is covered by villi, solid outgrowths of the epithelial layer, whichshow slight cavities at their bases into which the mesoderm protrudes. Thevilli extend into the uterine mucous membrane in such a way as to indicatethat epithelium, glands, and walls of blood-vessels in their path have been dis-integrated and not merely pushed aside; that is, they protrude freely into thematernal blood. In the somewhat later stage shown in Reicherts ovum () the villi are grouped in a band, leaving the two flat
The practice of obstetrics, designed for the use of students and practitioners of medicine . It is covered by villi, solid outgrowths of the epithelial layer, whichshow slight cavities at their bases into which the mesoderm protrudes. Thevilli extend into the uterine mucous membrane in such a way as to indicatethat epithelium, glands, and walls of blood-vessels in their path have been dis-integrated and not merely pushed aside; that is, they protrude freely into thematernal blood. In the somewhat later stage shown in Reicherts ovum () the villi are grouped in a band, leaving the two flattened poles of the ovumbare. Still later the villi become hollow with two distinct layers of epithelium,and soon are penetrated by blood-vessels which have entered the mesodermof the chorion. The simple club-shaped villi of the early ovum soon begin todegenerate on the side next to the decidua refiexa until in this part the chorionis smooth, chorion Icsve (Figs. 53 and 104). On the smaller area next the deciduaserotina, the villi become greatly enlarged and complexly branched, the blood-. FiG. 100.—Unruptured Human Ovum of about Third We£k, showing Chorion. X 2\.—{Authors case.) vessels of the embryo following the ramification. This part of the chorion iscalled the chorion frondosum, and becomes the fetal portion of the placenta(Figs. 53 and 100). The outer layer of the epithelium of the villi undergoes a peculiar modifica-tion. The cells, rapidly developing, do not entirely separate, but form a syn-cytium * with numerous nuclei. As seen from the first, this has a destructiveeffect on the uterine mucosa and blood-vessels (Fig. 64). On account of thetheoretical objections to the idea of contact of fetal epithelium and maternalblood with no intervening maternal structures, the syncytium has been consideredby many as an altered maternal structure covering the blood sinuses. Allthe evidence now accumulating seems to point in the direction above stated, * Syncytium: (i) A singl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
