File:Trilaminar embryo.jpg

From Embryology

Trilaminar_embryo.jpg(432 × 359 pixels, file size: 32 KB, MIME type: image/jpeg)

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.
Links: Gastrulation | Ectoderm | Mesoderm | Endoderm | Week 3

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

Cite this page: Hill, M.A. (2024, June 21) Embryology Trilaminar embryo.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

File history

Yi efo/eka'e gwa ebo wo le nyangagi wuncin ye kamina wunga tinya nan

current13:41, 23 April 2010Thumbnail for version as of 13:41, 23 April 2010432 × 359 (32 KB)S8600021 (talk | contribs)Trilaminar embryo (SEM) {{Template:SEM}}