Carnegie stage 4

Facts: Week 1, size 0.1-0.2 mm

Features: adplantation and implantation commences, increase in hCG

Links: Week 2

File:Week2_001_icon.jpg</wikiflv>

This animation shows the process of implantation, occurring during week 2 of development in humans.

The beginning of the animation shows: the uterus lining (endometrium epithelium), the hatched blastocyst with a flat outer layer of trophoblast cells (green), the inner cell mass which has formed into the bilaminar embryo (epiblast and hypoblast) and the large fluid-filled space (blastocoel).

green cells - trophoblast layer of the conceptus

blue cells - epiblast layer of the bilaminar embryo

yellow cells - hypoblast layer of the bilaminar embryo

white cells - uterine endometrium epithelium

red - maternal blood vessel (endometrial spiral arteries)

Links: Quicktime movie | Quicktime | Flash

Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline

Cite this page: Hill, M.A. (2024, May 21) Embryology Carnegie stage 4. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_4

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