Preferred Label : archenteron;
Uberon definition : The cavity of a gastrula forming a primitive gut.;
Uberon related term : primitive endodermal cavity; gastrocoel; mesenteron;
Uberon Development note : The primitive gut that forms during gastrulation in the developing blastula. It develops
into the digestive tract of an animal. As primary 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. This narrowing and
lengthening of the archenteron is driven by convergent extension. 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 archenteron
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
lip of the blastopore in amphibians and fish, and the primitive streak in birds and
mammals. Each is controlled by the dorsal blastopore, and primitive node (also known
as Hensen's node), respectively;
Origin ID : 0004735;
Automatic exact mappings (from CISMeF team)
- has part
- part of
The cavity of a gastrula forming a primitive gut.
