A theoretical and practical treatise on midwifery : including the diseases of pregnancy and parturition and the attentions required by the child from birth to the period of weaning . ertainly does not exhibit the same aspectat the advanced stages of pregnancy : for during early embryonic existence theexternal membrane of the ovum is thin, transparent, and perfectly smooth on itsouter surface, whilst about the second week this surface presents- some minutegranular elevations, which increase in length very rapidly, and the chorion soonbecomes studded with numerous villi. But at that time neither
A theoretical and practical treatise on midwifery : including the diseases of pregnancy and parturition and the attentions required by the child from birth to the period of weaning . ertainly does not exhibit the same aspectat the advanced stages of pregnancy : for during early embryonic existence theexternal membrane of the ovum is thin, transparent, and perfectly smooth on itsouter surface, whilst about the second week this surface presents- some minutegranular elevations, which increase in length very rapidly, and the chorion soonbecomes studded with numerous villi. But at that time neither the chorion northe villi have a proper vascular apparatus, since it is not until after the allantois,together with the umbilical vessels, has become applied to the chorion, that anyvessels can be detected going from this membrane, either to penetrate into allthe villi, or only, perhaps, into a portion of them. The chorion is enveloped in a great measure by the reflexed or epichorial deci-dua, which separates it from the parietal decidua; and is in contact, by a restrictedsurface, with a portion of the mucous membrane which constitutes the utero- // IE. U 59. .VAWjH ; ..-/•. ?.?•.? ????•• -». ?mm SS&S -^?-;;:,
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Keywords: ., boo, bookcentury1800, booksubjectmidwifery, booksubjectobstetrics
