![](/drem/stage5c/labels2/S43L.gif)
![chorionic cavity, cytotrophoblast, edge of primary umbilical vesicle cavity, exocoelomic (Heuser's) membrane, extra-embryonic mesoblast, lacunar vascular circle](/drem/stage5c/Z0/S43N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #7700 | Location: 05-03-06
Keywords: chorionic cavity, cytotrophoblast, edge of primary umbilical vesicle cavity, exocoelomic (Heuser's) membrane, extra-embryonic mesoblast, lacunar vascular circle
Source: The Virtual Human Embryo.