. Cunningham's Text-book of anatomy. Anatomy. 62 HUMAN EMBRYOLOGY chorion plate closing the intervillous spaces internally; (2) the villi; (3) the intervillous spaces; and (4) the basal layer of the trophoblast, which closes the intervillous spaces externally, and is perforated by the maternal vessels passing to and from the spaces. The maternal portion of the completed placenta consists from within outwards of (1) the basal layer of the decidua; (2) the remains of the spongy layer of the decidua ; and (3) the unchanged layer. Spongy lay Yolk sacs Umbilical cord Ectoderm of amnion Fused mesode
. Cunningham's Text-book of anatomy. Anatomy. 62 HUMAN EMBRYOLOGY chorion plate closing the intervillous spaces internally; (2) the villi; (3) the intervillous spaces; and (4) the basal layer of the trophoblast, which closes the intervillous spaces externally, and is perforated by the maternal vessels passing to and from the spaces. The maternal portion of the completed placenta consists from within outwards of (1) the basal layer of the decidua; (2) the remains of the spongy layer of the decidua ; and (3) the unchanged layer. Spongy lay Yolk sacs Umbilical cord Ectoderm of amnion Fused mesoderm of amnion and chorion Trophoblast Spongy layer of decidua Muscular wall of uteru; Compact layer of decidua. -Uterine tube -â Amnion cavity layer of decidua Fused mesoderm of amnion and chorion Fig. 80.âSchema of Pregnant Uterus immediately after Birth of the Child, showing commencing separation of the placenta. Part of the umbilical cord is shown in section and part m surface view Ihe blue streaks in the former part indicate the position occupied by the vitello-intestinal duct m earlier stages. The basal layer of the decidua is the remains of the compact part of the decidua basalis of earlier stages. It is fused internally with the basal plate of the tropho- blast, and is continuous externally with the spongy layer. The spongy layer con- sists of a series of cleft-like spaces. These spaces are the compressed remains of the earner dilated portions of the glands of the stratum spongiosum from which the epithelial lining has, to a great extent, disappeared. The spongy layer is con- tinuous externally with the unchanged layer, in which lie the unaltered outer parts of the glands and the intervening interglandular 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 Cunningham, D. J. (Daniel Jo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
