. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. FORMATION OF PROTECTIVE EMBRYONIC MEMBRANES 921 broken down to form liquefied areas, the embryotroph. It is possible that this liquefied material is assimilated by the syntrophoblast and passed inward to the developing germ disc. If this histological material thus is utilized it forms a source of nutrition, and it may be called histotrophic nutrition. c. Formation of the Placenta As the developing chorionic vesicle grows within the endometrium of
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. FORMATION OF PROTECTIVE EMBRYONIC MEMBRANES 921 broken down to form liquefied areas, the embryotroph. It is possible that this liquefied material is assimilated by the syntrophoblast and passed inward to the developing germ disc. If this histological material thus is utilized it forms a source of nutrition, and it may be called histotrophic nutrition. c. Formation of the Placenta As the developing chorionic vesicle grows within the endometrium of the uterus, the uterine mucosa expands over the growing vesicle (fig. 377A and B). That part of the endometrial tissue overlying the chorionic vesicle is called the decidua capsularis (fig. 377A), and the portion of the endometrial lining of the uterus not concerned with the enclosure of the chorionic vesicle is called the decidua vera or decidua parietalis. The part of the endometrium lying between the muscle tissue of the uterine wall and the enlarging villi (fig. 372C and D) of the chorionic vesicle is the decidua basalis (fig. 377A). At first chorionic villi are developed over the entire chorionic vesicle (fig. 372B), but as development goes on the villi in relation to the decidua parietalis are resorbed gradually to form a smooth area of the chorion, the chorion laeve (fig. 372D). Finally, only those villi in relation to the decidua basalis remain (fig. 372D). The villi within the decidua basalis enlarge and become the. SYNTROPHOBLAST TROPHOBLASTIC LACUNAE CYTOTROPHOBLAST EXTRA - EMBRYONIC MESODERM MESENCHYMAL CELLS BRUSH BORDER. 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 Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston
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