Abstract
The future shape of the discoid placenta is not visible in the early implantational stages. The earliest stage seen by this author was about 10 days post conceptional, i.e., some 3–5 days postimplantation (Figure 1). The trophoblast is a loose aggregation of cells resembling tissue-culture explants. The appearance of the trophoblast is seemingly random, with many open spaces and an irregular, hemorrhagic zone at the interface with the endometrial stroma. Delamination of prototrophoblastic cells from these anchors serve as the placental mesenchyme. This gives rise to angioblasts, fibroblasts, and placental reticuloendothelial (RE) cells. Hertig and Mansell (1956) described and illustrated a 7.5 day specimen consisting of a flat plate of trophoblast aligned parallel to the lumenal surface of the endometrial cavity. Both syncytial and cytotro- phoblast were identified but were interspersed. Segregation of cytotrophoblast into nodular masses with syncytial coats occurs later (Figure 2). The open spaces, or lacunae, eventually coalesce into the intervillous space, with communication to the maternal vascular system at the sites of hemorrhagic leaks. This previllous stage is seen generally about the inner cell mass, the future embryo, which also shows axial and orientational differentiation during this period.
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References
Bacsich, P., and Smout, C. F. V., 1937–1938, Some observations on the foetal vessels of the human placenta with an account of the corrosion technique, J. Anat. 72: 358–364.
Benirschke, K., and Driscoll, S. G., 1967, The Pathology of the Human Placenta, Springer-Verlag, New York.
Boe, F., 1953, Studies on the vascularization of the human placenta, Acta Obstet. Gynecol. Scand. (Suppl. 5 ) 23: 1–92.
Goodall, J. R., 1934, Circumcrescent and circumvallate placentas, Am. J. Obstet. Gynecol. 28: 707–722.
Gruenwald, P., 1963, Chronic fetal distress and placental insufficiency, Biol. Neonate 5: 215–265.
Gruenwald, P., 1966, The lobular architecture of the human placenta, Bull. Johns Hopkins Hosp. 119:172– 190.
Gruenwald, P., 1977, The development of the placental lobular pattern in the human. Review and reinterpretation of the material, Obstet. Gynecol. 49: 728–732.
Hamilton, W. J., and Boyd, J. D., 1960, Development of the human placenta in the first three months of gestation, J. Anat. 94: 297–328.
Hardwick, D. R., 1969, Weight and length of fetuses in relation to age, J. Reprod. Med. 2: 98–100.
Hertig, A. T., 1968, Human Trophoblast, Charles C Thomas, Springfield, 111.
Hertig, A. T., and Mansell, H., 1956, Hydatidiform mole and choriocarcinoma, in: Tumors of the Female Sex Organs, Atlas of Tumor Pathology, Section 9, Part 1, Fascicle 33, p. 37, Armed Forces Institute of Pathology, Washington, D.C.
Javert, C. T., and Barton, B., 1952, Congenital and acquired lesions of the umbilical cord and spontaneous abortion, Am. J. Obstet. Gynecol. 63: 1065–1077.
Kyriazis, A. A., and Esterly, J. R., 1970, Development of lymphoid tissues in the human embryo and early fetus, Arch. Pathol. 90: 348–353.
Kyriazis, A., Arean, V. M., and Shanklin, D. R., 1974, Placental-radiographic analysis of parasitic acardiac fetus: Partially common umbilical circulation, J. Re- prod. Med. 12: 74–81.
Longo, L. D., 1972, Disorders of placental transfer, in: Pathophysiology of Gestation, ( N. S. Assali, ed.), pp. 1–76, Academic Press, New York.
Maidman, J. E,. Thorpe, L. W., Harris, J. A., and Wynn, R. M., 1973, Fetal origin of X-cells in human placental septa and basal plate, Obstet. Gynecol. 41: 547–552.
Naeye, R. L., 1965, Organ abnormalities in a human parabiotic syndrome, Am. J. Pathol. 46: 829–842.
Pierce, G. B., and Midgley, A. R., 1963, The origin and220 function of human syncytiotrophoblastic giant cells, Am. J. Pathol. 43: 153–173.
Ramsey, E. M., 1966, Comparison of uteroplacental vasculature and circulation in the rhesus monkey and man, Contrib. Embryol 38: 59–70.
Ramsey, E. M., Martin, C. B., and Donner, M. W., 1967, Fetal and maternal placental circulations; simultaneous visualization in monkeys by radiography, Am. J. Ob- stet. Gynecol. 98: 419–423.
Scott, J. S., 1960, Placenta extrachorialis (placenta marginata and placenta circumfallata), J. Obstet. Gynaecol. Br. Commonw. 67: 904–918.
Shanklin, D. R., 1958, The human placenta: A clinicopathological study, Obstet. Gynecol. 11: 129–136.
Shankin, D. R., 1969, Pathology of the placenta, in: Pre-maturity and the Obstetrician, ( D. Cavanagh and M. R. Talisman, eds.), pp. 267–268, Appleton-Century- Crofts, New York.
Shanklin, D. R., 1970, The influence of placental lesions on the newborn infant, Pediat. Clin. North Am. 17: 25–42.
Shanklin, D. R., 1985, Tumors of the Placenta and Umbilical Cord, Atlas of Tumor Pathology, Series 2, Armed Forces Institute of Pathology, Washington, D. C., pp. 30–33, 50–57, 130–135.
Shanklin, D. R., and Scott, J. S., 1975, Massive subchorial thrombohaematoma (Breus’ mole), Br. J. Obstet. Gynaecol. 82: 476–487.
Shordania, J., 1929, Über das gefässsystem der Nabelschnur, Z. Gesamte Anat. 89: 696–726.
Shui, K. P., and Eastman, N. J., 1957, Coiling of the umbilical cord around the foetal neck, J. Obstet. Gynecol. Br. Commonw. 64: 227–228.
Torpin, R., and Hart, B. F., 1941, Placenta bilobata, Am. J. Obstet. Gynecol. 42: 38–49.
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© 1986 Plenum Press, New York
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Shanklin, D.R. (1986). Anatomy of the Placenta. In: Falkner, F., Tanner, J.M. (eds) Human Growth. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2101-9_11
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DOI: https://doi.org/10.1007/978-1-4613-2101-9_11
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