File:Embryo-membranes stage 11.jpg

From Embryology

Embryo-membranes_stage_11.jpg(600 × 568 pixels, file size: 61 KB, MIME type: image/jpeg)

Early Placentation (Carnegie stage 11)

Embryo with intact placental membranes Carnegie stage 11 in Week 4.

Note this view is from the chorion laeve side with the chorion frondosum on the lower side. The thinness of the chorionic membrane allows the embryo to be seen inside the chorionic sac. Compare this week 4 with the a similar lateral view in week 7.

Description

  • Embryo - Week 4, 23 - 26 days, 2.5 - 4.5 mm, Somite Number 13 - 20 (Scale 1 mm)
  • The image shows the intact gestational sac (10 mm diameter) with chorionic villi (white finger-like extensions) covering the chorionic membrane surface.
  • The chorion surface is now divided into 2 halves:
    • chorion laeve - (laeve = smooth) The smooth chorion found on conceptus away from maternal blood supply (towards uterine epithelium and cavity) with very few villi present.
    • chorion frondosum - (frondosum = leafy) the chorion found on conceptus oriented towards maternal blood supply where the majority of villi form and proliferate, will contribute the fetal component of the future placenta.


Links: Placenta Development | Carnegie stage 11 | Week 4 | Week 7 Gestational Sac


Placenta Links: placenta | Lecture - Placenta | Lecture Movie | Practical - Placenta | implantation | placental villi | trophoblast | maternal decidua | uterus | endocrine placenta | placental cord | placental membranes | placenta abnormalities | ectopic pregnancy | Stage 13 | Stage 22 | placenta histology | placenta vascular | blood vessel | cord stem cells | 2013 Meeting Presentation | Placenta Terms | Category:Placenta
Historic Embryology - Placenta 
1883 Embryonic Membranes | 1907 Development Atlas | 1909 | 1910 Textbook | 1917 Textbook | 1921 Textbook | 1921 Foetal Membranes |1921 human | 1921 Pig implantation | 1922 Single placental artery | 1923 Placenta Review | 1939 umbilical cord | 1943 human and monkey | 1944 chorionic villus and decidua parietalis | 1946 placenta ageing | 1960 first trimester placenta | 1960 monkey | 1972 Placental circulation | Historic Disclaimer

Cite this page: Hill, M.A. (2024, April 22) Embryology Embryo-membranes stage 11.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Embryo-membranes_stage_11.jpg

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

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current11:17, 6 October 2010Thumbnail for version as of 11:17, 6 October 2010600 × 568 (61 KB)S8600021 (talk | contribs)==Embryo with intact placental membranes (Carnegie stage 11)== '''Links:''' Placenta Development {{Template:UNSWimages}} Category:Placenta Category:Human Embryo Category:Carnegie Stage 11