Summary
The fetal vascularisation of the most peripheral three generations of stem villi has been studied by means of semithin serial sectioning and scanning electron microscopy of vessel casts in 50 human term placentas. The vessel types have been classified according to the structure of the vessel walls. Stem villi with a diameter of 200–400 μm are characterized by one smaller artery and one small vein, some arterioles and venules and capillaries of the paravascular net. Stem villi of about 150 μm diameter contain arterioles and muscular venules besides the paravascular capillary network. The last generation of stem villi measuring 80 to 100 μm in diameter exhibit a terminal arteriole and a collecting venule as well as up to ten paravascular capillaries. The luminal width of the arterial and venous stem vessels is considerably smaller than described for other vascular beds. This may partly be due to postpartal vascoconstriction. The capillaries of the paravascular net normally to not show sinusoidal dilation. They are arranged as long, hairpin-like, poorly branched loops connecting the arterial and venous stem vessels to each other.
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References
Arts NFT (1961) Investigations on the vascular system of the placenta. Part 1. Am J Obstet Gynec 82:147–158
Boe F (1953) Studies on the vascularization of the human placenta. Acta Obstet Gynec Scand 32 Suppl 5:1–92
Boyd JD, Hamilton WJ (1970) The human placenta. Heffer Cambridge
Danesino V (1950) Dispositivi di blocco ed anastomosi arterovenose nei vasi fetali della placenta umana. Arch Ostet Ginec 55:251–272
Goyri O'Neill JE (1983) Vascularizacao da placenta humana. Dissertacao Universidade Nova de Lisboa/Portugal
Habashi S, Burton GJ, Steven DH (1983) Morphological study of the fetal vasculature of the human term placenta: scanning electron microscopy of corrosion casts. Placenta 4:41–56
Kaufmann P (1982) Development and differentiation of the human placental villous tree. Bibl Anat 22:29–39
Kaufmann P, Sen DK, Schweikhart G (1979) Classification of human placental villi. I. Histology. Cell Tissue Res 200:409–423
Lee MML, Yeh MN (1983) Fetal circulation of the placenta: a comparative study of human and baboon placenta by scanning electron microscopy of vascular casts. Placenta 4:515–526
Leiser R (1985) Fetal vasculature of the human placenta: scanning electron microscopy of microvascular casts. Contr Gynec Obstet 13:27–31
Leiser R, Kohler T (1983) The blood vessels of the cat girdle placenta. Observations on corrosion casts, scanning electron microscopical and histological studies. I. Maternal vasculature. Anat Embryol 167:85–93
Leiser R, Kohler T (1984) The blood vessels of the cat girdle placenta. Observations on corrosion casts, scanning electron microscopical and histological studies. II. Fetal vasculature. Anat Embryol 170:209–216
Mayer M, Panigel M, Leclerc-Polyak H (1956) Observations sur l'aspect et la disposition des vaisseaux et capillaires foetaux dans le placenta humain. Gynec Obstet 55:257–280
Ramsey EM, Donner MW (1980) Placental vasculature and circulation. Georg Thieme, Stuttgart
Rhodin JAG (1967) The ultrastructure of mammalian arterioles and precapillary sphincters. J Ultrastruct Res 18:181–223
Rhodin JAG (1968) Ultrastructure of mammalian venous capillaries, venules, and small collecting veins. J Ultrastruct Res 25:452–500
Rhodin JAG (1974) Histology. A text and atlas. New York-Oxford University Press London Toronto
Schweikhart G, Kaufmann P (1977) Zur Abgrenzung normaler, artefizieller und pathologischer Strukturen in reifen menschlichen Plazentazotten. I. Ultrastruktur des Syncytiotrophoblasten. Arch Gynäk 222:213–230
Sen DK, Kaufmann P, Schweikhart G (1979) Classification of human placental villi. II. Morphometry. Cell Tissue Res 200:425–434
Spanner R (1935) Mütterlicher und kindlicher Kreislauf der menschlichen Placenta und seine Strombahnen. Z ges Anat, 1. Z Anat Entw 105:163–242
Thiriot M, Panigel M (1978) Microcirculation. La microvascularisation des villosités placentaires humaines. CR Acad Sci Paris Ser D 287:709–712
Wilkin P (1954) Contribution à l'étude de la circulation placentaire d'origine foetale. Gynec Obstet 53:239–263
Zeek PM, Assali NS (1950) Vascular changes in the decidua associated with eclamptogenic toxemia of pregnancy. Am J Clin Path 20:1099–1109
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Leiser, R., Luckhardt, M., Kaufmann, P. et al. The fetal vascularisation of term human placental villi. Anat Embryol 173, 71–80 (1985). https://doi.org/10.1007/BF00707305
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DOI: https://doi.org/10.1007/BF00707305