A treatise on the science and practice of midwifery . ne, which is con-nected with the development of the chorion. The amnion is the mostinternal of the membranes surrounding the foetus, and will presentlybe studied more in detail. It soon becomes distended with fluid, theliquor amnii, and as this increases in amount it separates the amnionm<»re and more from the uterus^ Changes in the Mucous Layer.— During this time the innermostlayer of the blastodermic membrane or hypoblast is also developingtwo projection-at either extremity of the foetus, and these graduallyapproach each other anterior
A treatise on the science and practice of midwifery . ne, which is con-nected with the development of the chorion. The amnion is the mostinternal of the membranes surrounding the foetus, and will presentlybe studied more in detail. It soon becomes distended with fluid, theliquor amnii, and as this increases in amount it separates the amnionm<»re and more from the uterus^ Changes in the Mucous Layer.— During this time the innermostlayer of the blastodermic membrane or hypoblast is also developingtwo projection-at either extremity of the foetus, and these graduallyapproach each other anteriorly. the hypoblast ia in contact withthe yelk, when these meet they have the effect of dividing the yelkinto two portions. One, and the Bmaller of the two. forms eventu-ally the intestinal canal of the foetus: the other, and much the larger,contains the greater portion of the yelk, and forms the ephemeralstructure known as the umbilical vesicle, from which the foetus derivesmost of its nourishment during the early stage of existence. Development of the membrane. 2. External layerof blastodermic membrane. •*. Internallayers forming the umbilical vesicle. vessels. .0. Projections Conn-ing amnion. 6. Allantoic 96 PREGNANCY. communication with the abdominal cavity of the foetus is throughthe constricted portion at the point of division called the vitellineduct (Fig. 52). An artery and vein, the omphalo-mesenteric, ramifyon the vesicle and its duct. Fig. 52.
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
