Embryonic disc
| Embryonic disc | |
|---|---|
 Section through embryonic disk of Vespertilio murinus. | |
 | |
| Details | |
| Carnegie stage | 4 |
| Identifiers | |
| Latin | discus embryonicus |
| TE | disc_by_E2.0.1.2.0.0.14 E2.0.1.2.0.0.14 |
| Anatomical terminology | |
The floor of the amniotic cavity is formed by the embryonic disc (or embryonic disk) composed of a layer of prismatic cells, the embryonic ectoderm, derived from the inner cell-mass and lying in apposition with the endoderm.
In humans, it is the stage of development that occurs after implantation and prior to the embryonic folding (e.g. seen between about day 14 to day 21 post fertilization). It is derived from the epiblast layer, which lies between the hypoblast layer and the amnion. The epiblast layer is derived from the inner cell mass. Through the process of gastrulation, the bilaminar embryonic disc becomes trilaminar. The notochord forms thereafter. Through the process of neurulation, the notochord induces the formation of the neural tube in the embryonic disc.
References
This article incorporates text in the public domain from page 47 of the 20th edition of Gray's Anatomy (1918)
External links
 | This developmental biology article is a stub. You can help Wikipedia by expanding it. |