File:Placental villi 5.jpg

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Human Term Placental Villi

  • Placental villi at term.
  • Note both the larger number of smaller villi at the same magnification as the first trimester.
  • The second difference is in the cell layer now forming the shell of each villi.
  • Surface layer of vill now lack cytotrophoblast cell layer and now are covered with only a syncitotrophoblast layer (shell).
  • Syncitotrophoblast layer is variable in thickness from a thin cytoplasmic layer to regions of clumped nuclei.
  • Vill core mainly occupied by fetal capillaries and larger blood vessels, with only a small amount of connective tissue.
  • Fetal red blood cells now appear to lack the earlier distinctive nuclei.


Villi Histology: First trimester (overview | villi | detail) | fetal and maternal RBCs | Term (overview | villi | detail) | Cord Histology | Placenta Histology | Placenta Development




Links: Histology | Histology Stains | Blue Histology images copyright Lutz Slomianka 1998-2009. The literary and artistic works on the original Blue Histology website may be reproduced, adapted, published and distributed for non-commercial purposes. See also the page Histology Stains.


Cite this page: Hill, M.A. (2024, April 23) Embryology Placental villi 5.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Placental_villi_5.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

placenta, term, cross-section, human H&E x4

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current02:41, 1 April 2012Thumbnail for version as of 02:41, 1 April 20121,280 × 1,024 (238 KB)Z8600021 (talk | contribs)
16:40, 3 August 2009Thumbnail for version as of 16:40, 3 August 20091,280 × 1,024 (517 KB)MarkHill (talk | contribs)Human placental villi cross-section placenta, term, human H&E x4 reproductive system, female, chorionic villi original file name Pll04he.jpg Image Source: UWA Blue Histology http://www.lab.anhb.uwa.edu.au/mb140/CorePages/FemaleRepro/femalerepro.htm