. The physiology of reproduction. Reproduction. FCETAL NUTRITION: THE PLACENTA 393 the yolk-sac are produced, and from their walls sohd masses of cells are budded ofi, resembling hver-tissue in its simplest form and perhaps functioning as such (von Spee ^). The sac grows up to the end of the fourth week. It is then pear-shaped, and. Fig. 86.—Hypothetical section of the human ovum embedded in the decidua, somewhat younger than Peters' ovum. The trophoblast is greatly thickened, and lined with mesoderm, which surrounds also the embryonic rudiment, with its yolk-sac and amnio-embryonic cavity (T.
. The physiology of reproduction. Reproduction. FCETAL NUTRITION: THE PLACENTA 393 the yolk-sac are produced, and from their walls sohd masses of cells are budded ofi, resembling hver-tissue in its simplest form and perhaps functioning as such (von Spee ^). The sac grows up to the end of the fourth week. It is then pear-shaped, and. Fig. 86.—Hypothetical section of the human ovum embedded in the decidua, somewhat younger than Peters' ovum. The trophoblast is greatly thickened, and lined with mesoderm, which surrounds also the embryonic rudiment, with its yolk-sac and amnio-embryonic cavity (T. H. Bryoe in Quain's Anatomy). The embryonic rudiment is proportionally on too large a scale. is united to the intestine by a long neck in which the cavity is obliterated. The vesicle persists throughout pregnancy. Little is known of its contents ; at the end of pregnancy it contains variable quantities of fatty substances and carbonates (Schultze '). ' See Quain's Anatomy, vol. i., Part I., 1908. ' Schultze, " Ueber die Embryonalhiillen und die Placenta der Saugethiere und des Menschen," Sitzungsb. d. WUniburger Qesell., 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 Marshall, F. H. A. (Francis Hugh Adam), 1878-1949; Cramer, William, 1878-1945; Lochhead, James. London, New York, Longmans, Green
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreproduction, bookyea
