A textbook of obstetrics . Fig. III. — Decidua vera, decidua reflexa, the chorion and amnioi I [2 THE DECIDUAL. 43 confined entirely to the deeper portions of the membrane, consti-tuting, finally, what is known as the glandular or spongy its early stage of development the uterine decidua is richlysupplied with blood; the capillary loops spring up luxuriouslyinto the interglandular spaces ; while deeper down, between theglandular layer and the uterine muscle, may be found numerousand extensive blood-sinuses. As, however, the ovular deciduacomes in contact with the uterine decidua, the
A textbook of obstetrics . Fig. III. — Decidua vera, decidua reflexa, the chorion and amnioi I [2 THE DECIDUAL. 43 confined entirely to the deeper portions of the membrane, consti-tuting, finally, what is known as the glandular or spongy its early stage of development the uterine decidua is richlysupplied with blood; the capillary loops spring up luxuriouslyinto the interglandular spaces ; while deeper down, between theglandular layer and the uterine muscle, may be found numerousand extensive blood-sinuses. As, however, the ovular deciduacomes in contact with the uterine decidua, the blood-vessels aresubjected to pressure and the stage of atrophy begins in the end* >-metrium. The blood-vessels disappear ; a fatty degeneration maybe seen in the cellular layer ; no trace of epithelium remains in thesuperficial layer of the membrane, although epithelial cells persistin the glandular layer ; and, finally, as labor begins, the uterinedecidua separates into two parts, the line of division running. Fig. 112.—Decidua vera and decidua reflexa. through the glandular layer, or between the compact and glan-dular layers, the latter remaining behind in the uterus to furnishthe nucleus of a new mucous membrane, which soon after labortakes the place of that which has been partly cast off. The historyof the ovular decidua is one of atrophy almost from the the growing ovum pushes out this portion of the uterinemucous membrane upon the pole of the sphere directly oppositethe placental decidua, the epithelium of the membrane begins todisappear and the blood-vessels are soon obliterated, so that at theend of the third month, when the ovular comes in contact withthe uterine decidua, the former consists of not much more than asingle layer of flattened and elongated cells. The development i >fthe placental decidua has been described with that o\ the placenta. 44 PREGNANCY. Diseases of the Deciduae.—The decidual mucous membraneof the pregnant uterus may be
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
