. Human embryology and morphology. Embryology, Human; Morphology. DEVELOPMENT OF THE OVUM. 93 part by the decidua serotina. Villi containing vessels grow out from the chorion into the decidua. line of union ^5^—prechorion. embryo amnion somatop/eure coelom splanchnopleure Fig. 72.—Showing the folds of the somatopleure uniting over the embryo and becom- ing demarcated into Amnion and Prechorion. Origin of Ova and Spermatozoa.—The cells which give rise to the ova and spermatozoa, according to sex, are derived from the mesothelial lining of the coelom. They appear with the cleavage neural canal a
. Human embryology and morphology. Embryology, Human; Morphology. DEVELOPMENT OF THE OVUM. 93 part by the decidua serotina. Villi containing vessels grow out from the chorion into the decidua. line of union ^5^—prechorion. embryo amnion somatop/eure coelom splanchnopleure Fig. 72.—Showing the folds of the somatopleure uniting over the embryo and becom- ing demarcated into Amnion and Prechorion. Origin of Ova and Spermatozoa.—The cells which give rise to the ova and spermatozoa, according to sex, are derived from the mesothelial lining of the coelom. They appear with the cleavage neural canal aorta Wolff an duct. Wolffian body Mullerian duct genital ridge Fig. 73.—Diagrammatic section of the abdominal region of the coelom, showing the position of the Genital Ridges from which the Ovary or Testicle is formed. of the mesoblast and formation of the coelom. Soon after the coelom is formed (beginning of third week) a ridge—the genital ridge—is seen on the roof of the coelom, situated on each side of the attachment of the mesentery of the gut (Fig. 73). The ridge lies over the intermediate cell mass (Fig. 85; p. 111), and is covered. 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 Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
