A textbook of obstetrics . Obstetrics, 1S87. 3 Schatz, loc. cit. * See Lusk, op. p. 233, ed. 1886 B For some interesting observations which would seem to indicate the possibility,at least, of ovulation during pregnancy, see Ovulation During Pregnancy, Chris-topher, Am. Jour. Obstetrics, 1886, p. 457. 92 PREGNANCY. embryo—namely, the amnion, the chorion, the allantois, andthe placenta ; Lastly, the deciduae, the maternal envelope of the fetus. THE AMNION. After segmentation has occurred, and after the interior ofthe ovum has become reduced to a granular mass, around whichis a membrane com
A textbook of obstetrics . Obstetrics, 1S87. 3 Schatz, loc. cit. * See Lusk, op. p. 233, ed. 1886 B For some interesting observations which would seem to indicate the possibility,at least, of ovulation during pregnancy, see Ovulation During Pregnancy, Chris-topher, Am. Jour. Obstetrics, 1886, p. 457. 92 PREGNANCY. embryo—namely, the amnion, the chorion, the allantois, andthe placenta ; Lastly, the deciduae, the maternal envelope of the fetus. THE AMNION. After segmentation has occurred, and after the interior ofthe ovum has become reduced to a granular mass, around whichis a membrane composed of a single layer of cells, at a certainpoint—the embryonal area—in this membrane there appears athickening, by a heaping up of the cells. Finally this mass ofcells resolves itself into two layers (ecto- and entoderm), andbetween these two appears another layer of cells (mesoderm). The outer layer, the ectoderm, sends a prolongation aroundthe whole interior surface of the ovum, and this layer receives a eg c ec. Fig. 70.—e, Embryo ; ec, cephalicextremity; eg, caudal extremity; catca, amniotic hood ; //, pp, pleuroperi-toneal cavity; j, umbilical vesicle.
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