File:Trilaminar embryo.jpg: Difference between revisions

Trilaminar Embryo (SEM)

The embryonic disc has been broken to expose the early three germ layers that form the entire embryo (scanning electron micrograph).

1. Ectoderm - columnar epithelium
2. Mesoderm - embryonic connective tissue (mesenchyme)
3. Endoderm - cuboidal epithelium

• The amniotic cavity would lie above the ectoderm layer.
• The yolk sac would initially lie below the endoderm layer, later this would be the gastrointestinal tract within the embryo.

Image Source: Scanning electron micrographs of the Carnegie stages of the early human embryos are reproduced with the permission of Prof Kathy Sulik, from embryos collected by Dr. Vekemans and Tania Attié-Bitach. Images are for educational purposes only and cannot be reproduced electronically or in writing without permission.

Embryonic Development