Archenteron
1198851
194622437
2008-02-28T09:09:59Z
Paddy Simcox
6460516
Infobox is for another structure (related, but still confusing). Removing until somebody replaces it correctly
The '''archenteron''' is known as the primitive gut that forms during [[gastrulation]] in the developing [[blastula]]. It develops into the digestive tract of an animal.
==Formation of the Archenteron==
<small>[See [[Gastrulation]]]</small>
As [[mesenchyme]] cells detach from the [[vegetal pole]] in the blastula and enter the fluid filled cavity in the center (the [[blastocoel]]), the remaining cells at the vegetal pole flatten to form a [[vegetal plate]]. This buckles inwards towards the blastocoel in a process called [[invagination]]. The cells continue to be rearranged until the shallow dip formed by invagination transforms into a deeper, narrower pouch formed by the [[gastrula]]'s [[endoderm]]. The open end of the archenteron is called the [[blastopore]].
The [[filopodia]]--thin fibers formed by the mesenchyme cells--found in a late gastrula contract to drag the tip of the archeteron across the blastocoel. The endoderm of the archenteron will fuse with the [[ectoderm]] of the blastocoel wall. At this point gastrulation is complete, and the gastrula has a functional digestive tube.
The indentation that is actually formed is called the ''[[blastopore]] lip'' in [[amphibian]]s and [[fish]], and the ''primitive streak'' in [[bird]]s and [[mammal]]s. Each is controlled by the dorsal blastopore, and primitive node, respectively.
==External links==
* [http://chsweb.lr.k12.nj.us/mstanley/outlines/animals/antax/image51.gif Diagram]
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{{Embryology}}
[[Category:Developmental biology]]
[[fr:Archentéron]]
[[it:Archenteron]]
[[pt:ArquĂȘntero]]