archenteron


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archenteron

[¦ärk′en·tə‚rän]
(embryology)
The cavity of the gastrula formed by ingrowth of cells in vertebrate embryos. Also known as gastrocoele; primordial gut.
References in periodicals archive ?
erythrogramma, the movement and destination of cells as they travel over the blastopore lip and into the archenteron differ from typical feeding larval development (Wray and Raff 1991a).
cidaris "may actually represent the very early tip of the invaginating archenteron, which in Eucidaris is loosely organized and could be mistaken for ingressing cells.
The mouth and esophagus may form as either an extension of the blastopore or as a secondary invagination, connecting it to the archenteron with the anus between it and the chaetal sac.
A true gastrula with sealed epihelia and an archenteron is seen in all eumetazoans, both in the larval and adult organization of enidarians and ctenophores (and acoelomorphs) and as an ontogenetic stage in eubilaterians.
In this type, the stomodeum fused to the anterior tip of the archenteron and then the archenteron differentiated into intestine, stomach, and esophagus.
During gastrulation, it appeared that one side of the embryo contributed more dark cells to the developing archenteron than the other.
The determinant for archenteron in starfish: co-culture of an animal eff fragment-derived cell cluster and selected blastomere.
After secondary invagination, the gut rudiment results in a slender tube-like archenteron.
However, the expression is not detected in the extending tip of the invaginating archenteron, but remains at the blastopore region.
During reformation of the secondary pluteus, the epidermis covering the arms appears to be pulled towards the inner vee of the arms, presumably providing the cells for invagination and formation of the archenteron.
The vegetal part of this gastrular epithelium invaginates to form the archenteron [ILLUSTRATION FOR FIGURE 5D OMITTED], while the animal part of the epithelium becomes thinner [ILLUSTRATION FOR FIGURE 5B AND E OMITTED].
Gastrulae (24 h) have a spacious archenteron and the blastocoel is a narrow space in which mesenchyme cells are evident [ILLUSTRATION FOR FIGURE 3A OMITTED].