Skip to main content
Library homepage
 

Text Color

Text Size

 

Margin Size

 

Font Type

Enable Dyslexic Font
Biology LibreTexts

3: Cleavage and Gastrulation

( \newcommand{\kernel}{\mathrm{null}\,}\)

Thumbnail: The process of gastrulation. Gastrulation occurs when a blastula, made up of one layer, folds inward and enlarges to create a gastrula. A gastrula has 3 germ layers--the ectoderm, the mesoderm, and the endoderm. Some of the ectoderm cells from the blastula collapse inward and form the endoderm. The blastospore is the hole created in this action. Whether this blastospore develops into a mouth or an anus determines whether the organism is a protostome or a dueterostome. This diagram is color coded. Ectoderm, blue. Endoderm, green. Blastocoel (the yolk sack), yellow. Archenteron (the gut), purple. (Public Domain; Abigail Pyne).


This page titled 3: Cleavage and Gastrulation is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Ajna Rivera.

Support Center

How can we help?