. A laboratory manual and text-book of embryology. Embryology. I- THE UTERUS DURING. MENSTRUATION AND PREGNANCY 247 H1. • . grow, the trophectoderm is used irp in forming the syncytium, so that at term the trophoderm is the only continuous epithelial layer of the villi (Fig. 241 B). About the margin of the placenta the trophectoderm persists as the closing ring, which is continuous with the epithelium of the chorion lteve. Syncytial giant cells found in the decidua basalis are said to be derived from the trophoderm of the villi, Uterine decidual sepimn. Decidua basalis ^.Intervillous
. A laboratory manual and text-book of embryology. Embryology. I- THE UTERUS DURING. MENSTRUATION AND PREGNANCY 247 H1. • . grow, the trophectoderm is used irp in forming the syncytium, so that at term the trophoderm is the only continuous epithelial layer of the villi (Fig. 241 B). About the margin of the placenta the trophectoderm persists as the closing ring, which is continuous with the epithelium of the chorion lteve. Syncytial giant cells found in the decidua basalis are said to be derived from the trophoderm of the villi, Uterine decidual sepimn. Decidua basalis ^.Intervillous space Syncytium Fig. 240.—Scheme of placental circulation (Kollmann's Handatlas). Arrows indicate supply and exhaust of blood in the intervillous spaces. also a portion of the canalized fibrin found in the decidua basalis of the placenta near term. Decidua Basalis.—This, the maternal placenta, like the decidua vera is dif- ferentiated into a compact layer or basal plate which forms the floor of the inter- villous spaces, and into a deep spongy layer (Figs. 239 and 240). The first is the remains of the compact layer of the uterine mucosa formed during the premenstrual phase and partially destroyed by the implantation of the ovum. The second is the modified spongy layer of the premenstrual period and, though thinner, shows the same differentiation as does this same layer in the decidua vera. The glandular spaces are less numerous in the spongy layer of the decidua basalis and between. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectembryology, bookyear1
