archenteron


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archenteron

 [ahrk-en´ter-on]
the central cavity that is the provisional gut in the gastrula; the primordial digestive cavity of the embryo.

primordial gut

a flat sheet of intraembryonic endoderm that will change into a tubular gut due to the folding of embryonic body-head, tail, and lateral body folds.

archenteron

/arch·en·ter·on/ (ahrk-en´ter-on) the primordial digestive cavity of those embryonic forms whose blastula becomes a gastrula by invagination.

archenteron

(är-kĕn′tə-rŏn′, -tər-ən)
n.
The central cavity of the gastrula, which ultimately becomes the intestinal or digestive cavity.

ar′chen·ter′ic (är′kĕn-tĕr′ĭk) adj.

archenteron

[arken′təron] pl. archentera
Etymology: Gk, arche, beginning, enteron, intestine
the primitive digestive cavity formed by invagination into the gastrula, which is lined with entoderm during the embryonic development of many animals. It corresponds to the tubular cavity in the vertebrates that connects the amniotic cavity with the yolk sac. Also called archigaster, coelenteron, gastrocoele, primitive gut. See also gastrula. archenteric, adj.

archenteron

The embryonic digestive tract.
Archenteronclick for a larger image
Fig. 44 Archenteron . Formation of the archenteron in an amphibian embryo.

archenteron

that part of the developing embryo of animals (BLASTULA) formed by an invagination of MESODERM and ENDODERM cells into the blastocoel which ultimately forms the gut. The archenteron opens to the exterior via the blastopore.

archenteron

the central cavity that is the provisional gut in the gastrula; the primitive digestive cavity of the embryo.
References in periodicals archive ?
1F) may impede fusion of the tip of the archenteron with the ectoderm and delay formation of the mouth in each species.
Micromere descendants at the blastula stage are involved in normal archenteron formation in sea urchin embryos.
By this point, gastrulation has taken place and the archenteron is well developed.
In the polychaete Eunice kobiensis, the anus also forms in the region in which the archenteron opens, and the stomodeum forms as a separate, secondary invagination (Akesson, 1967).
The archenteron of both types differentiated into intestine, stomach, and esophagus.
scoparius, while others had a nonfunctional gut lacking a connection between the anterior tip of the archenteron and the stomodeum.
At 24 h postfertilization, at which time control embryos had formed gastrulae, the embryos treated with acidified seawater alone were morphologically abnormal, many with distorted shapes or abnormal archenterons, and some embryos had multiple archenterons (Fig.
During secondary invagination, a population of secondary mesenchyme cells (SMCs) connect the archenteron tip to the inner surface of the apical plate and exert the force to pull up the archenteron (Dan and Okazaki, 1956; Hardin, 1988).
Mesenchymal cells are present in the blastocoel (of the arms), but are associated with the skeletal rods and do not seem to contribute to the formation of the archenteron or the axohydrocoels.
Gastrulation in echinoderms involves two simultaneous but relatively independent processes, invagination to form the archenteron and migration of the primary mesenchyme cells.
exigua are (1) the absence of the bipinnaria larva and ciliated bands; (2) the early closure of the blastopore; and (3) the failure of the archenteron to connect with a stomodeum.
As a result of these vegetal cell movements, an archenteron resembling that of B.