Blastoderm Knowpia

A blastoderm (germinal disc, blastodisc) is a single layer of embryonic epithelial tissue that makes up the blastula.^[1] It encloses the fluid filled blastocoel. Gastrulation follows blastoderm formation, where the tips of the blastoderm begins the formation of the ectoderm, mesoderm, and endoderm.^[2]

Formation edit

The blastoderm is formed when the oocyte plasma membrane begins cleaving by invagination, creating multiple cells that arrange themselves into an outer sleeve to the blastocoel.^[1]

In oviparous animals edit

In chicken eggs, the blastoderm represents a flat disc after embryonic fertilization.^[3] At the edge of the blastoderm is the site of active migration by most cells.^[4]

References edit

^ ^a ^b Gilbert, Scott F. (2000). Early Drosophila Development (6 ed.). Sunderland (MA): Sinauer Associates. Retrieved 20 April 2018.
^ "blastoderm". The Free Dictionary. Retrieved 20 April 2018.
^ "Tutorial on chick early development". www.ucl.ac.uk. University College London.
^ Bellairs, Ruth; Osmond, Mark. Atlas of Chick Development (3 ed.). Atlas Press. p. 15–28.

Campbell Reece, Biology 7th edition, Pearson Publishing, 2005

[Gilbert-1] Gilbert, Scott F. (2000). Early Drosophila Development (6 ed.). Sunderland (MA): Sinauer Associates. Retrieved 20 April 2018.

[2] "blastoderm". The Free Dictionary. Retrieved 20 April 2018.

[3] "Tutorial on chick early development". www.ucl.ac.uk. University College London.

[4] Bellairs, Ruth; Osmond, Mark. Atlas of Chick Development (3 ed.). Atlas Press. p. 15–28.

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Summary

Formation edit

In oviparous animals edit

See also edit

References edit