Origin & Structure Of Extraembryonic Tissues In The Human Placenta Redman CWG, Sargent IL, Starkey PM, Blackwell Scientific Publications Oxford 1993

Origin & Structure Of Extraembryonic Tissues In The Human Placenta Redman  CWG, Sargent IL, Starkey PM, Blackwell Scientific Publications Oxford 1993

Origin and Structure

Fig 4: Uterine insertion of the human placenta: AV = anchoring villi, CCC = cytotrophoblast cell column, CL = villous cytotrophoblast, Langhans layer, CTS = cytotrophoblast shell, DC = cells of the maternal decidua basalis, IAC = intra-arterial trophoblast cells in the walls and lumen of the maternal spiral artery, ICT = interstitial cytotrophoblast at the insertion of the basal plate, IVS = intervillous space, Sb = syncytiotrophoblast bud, SEm = syncytiotrophoblast embolous carried by the venous blood returning from the placenta to the maternal circulation, SpA = maternal uteroplacental spiral artery, TGC = trophoblast multinucleate giant cell, UVL = uterine vein lumen, VST = syncytiotrophoblast of the chorionic villous tissue.


 We have recently reviewed (Panigel et al., 1985; Panigel, 1986) the distribution in the human
placenta of the cellular constituents of the maternal-fetal junctional zone in the ‘placenta bed’.
These constituents are described in Fig. 4. Metabolically active trophoblast is not only found in the
cellular and syncytial covering of the chorionic villi, but is also observed in the amniochorion, in
the cell columns at the tip of the anchoring villi and in the ‘basal plate’ of the placenta. Giant
multinucleate trophoblast cells migrate into the decidua basalis and the myometrium. In addition,
endovascular or ‘intra-arterial’ cytotrophoblasts migrate against the blood stream, along the lumen
and the wall of the uteroplacental spiral arteries carrying maternal blood into the intervillous space
of the placenta. Finally, ‘deported’ trophoblasts disseminate through the uteroplacental veins into
the maternal circulation, and embolize in the lungs.


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