![](/drem/stage20/labels2/S23L.gif)
![artifact fracture(s), artifact separation(s), loose connective tissue, osteogenic layer, roof plate of mesencephalon, surface ectoderm, tectum of mesencephalon](/drem/stage20/Z0/S23N.jpg)
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Carnegie Embryo #462 | Location: 1-02-03
Keywords: artifact fracture(s), artifact separation(s), loose connective tissue, osteogenic layer, roof plate of mesencephalon, surface ectoderm, tectum of mesencephalon
Source: The Virtual Human Embryo.