Identifier : kirkeshandbookof00kirk ( find matches )
Title : Kirkes' handbook of physiology
Year : 1907 ( 1900s )
Authors : Kirkes, William Senhouse, 1823-1864 Greene, Charles Wilson, 1866-1947
Subjects : Physiology
Publisher : New York, W. Wood and company
Contributing Library : Columbia University Libraries
Digitizing Sponsor : Open Knowledge Commons

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ble. These have been named the decidua vera, thedecidua basalis, and the decidua capsularis. In connection with these villous processes of the chorion, there are de-veloped depressions or crypts in the decidua vera, which correspond in shapeto the villi they are to lodge; and thus the chorionic villi become more orless embedded in the maternal structures. These uterine crypts, it is im- (I!) 1 DEVELOPMENT portant to note, arc not, as was once supposed, merely the open mouths ofthe uterine follicles. The Placenta. During these changes the deeper part of the mucousmembrane of the uterus, at and near the region where the placenta isplaced, becomes hollowed out by sinuses, or cavernous spaces, which com-municate on the one hand with arteries and on the other with veins of theuterus. Into hese sinuses the villi of the chorion protrude, pushing the thin Unchanged layer Stratum spongiosumStratum compactum Placental vil. DecWua basalis Maternal vessel Primitive streakMesoderm Placental villus
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Fig. 502. -Diagram of the Early Stage of Human Embryo in Relation to the Uterus.(Cunningham.)
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