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amnion, embryonic ectoderm, embryonic endoderm, embryonic mesoderm, extra-embryonic coelom, extra-embryonic ectoblast, extra-embryonic endoblast, extra-embryonic mesoblast, notochordal process, umbilical vesicle

A section through the cranial part of the embryonic disc.

Observe:
1. The notochordal process between ectoderm and endoderm.
2. The slight convexity of the ectoderm in the midline.
3. The turned up margins of ectoderm that are continuous with the inner layer of the amnion.
4. Scant amounts of mesoderm that are continuous with extraembryonic mesoblasts.


Keywords: amnion, embryonic ectoderm, embryonic endoderm, embryonic mesoderm, extra-embryonic coelom, extra-embryonic ectoblast, extra-embryonic endoblast, extra-embryonic mesoblast, notochordal process, umbilical vesicle

Source: Atlas of Human Embryos.