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

ar′chen·ter′ic (är′kĕn-tĕr′ĭk) adj.


(Anatomy) the cavity within an embryo at the gastrula stage of development that eventually becomes the digestive cavity
[C19: from Greek arkhē beginning + enteron intestine]
archenteric adj


(ɑrˈkɛn təˌrɒn)

pl. -ter•a (-tər ə)
the primitive enteron or digestive cavity of a gastrula.
arch`en•ter′ic (-ˈtɛr ɪk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.archenteron - central cavity of the gastrulaarchenteron - central cavity of the gastrula; becomes the intestinal or digestive cavity
gastrula - double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
blastopore - the opening into the archenteron
bodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the body
References in periodicals archive ?
2] The Kovalevsky or neurenteric canal is defined as a canal connecting the neural tube and archenteron in the embryo, resulting from a persisting abnormal communication between the notochord and yolk sac and the amnion during an early stage of embryonic development.
ENTEROCOELE the body cavity formed from an outpocketing of the archenteron (a primitive digestive cavity), especially typical of echinoderms and chordates [RHD].
At 20-30 [micro]M (Figures 4 and 6), the larvae remained motile, retained the blastopore and the lower part of archenteron and generally survived through the next 1-2 days; they did not lose their extralarval caps (category III).
Some features of early embryos (the blastocoel, the archenteron of the gastrula) could be seen in specimens pressed gently between a glass slide and coverslip.
Three of the sampled embryos were late gastrulae, with an archenteron filled with granular material, but not forming coeloms (data not shown).
5 h Eight-cell embryos 9 h 16-cell embryos 23 h Unhatched blastulae; wrinkled with a clear blastocoel and irregular blastoderm 47 h * Hatched blastulae; apical tuft visible 73 h Initiation of gastrulation 4 days Mid-stage gastrulae; archenteron about 1/2 way into blastocoel 7 days Gastrulae that are compressed; first spicules visible with cross-polarized light 8 days Prisms 14 days Two-arm plutei with open mouths 33 days Four and six-arm plutei 48 days Formation of lobes begins 79 days Juvenile rudiments with podial buds and pedicellariae 120 days Metamorphosis; juvenile spine count ranges from 5 to 23 * Blastulae were unhatched at 23 and 33 h.
The resulting blastopore started as a wide pit, subsequently deepening into the archenteron (Fig.
During the initial stages of digestive organ development, the archenteron of mouth-forming larvae (36 h) had no TRITC-phalloidin-positive fibrous structures (Fig.
The invaginated archenteron retains a narrow but definite lumen.
Haeckel (1874) suggested that the eumetazoan ancestor was a gastraea with ectoderm, endoderm, and archenteron with blastopore, essentially having the same structure as that of larval and adult cnidarians and of ontogenetic stages of many bilaterians.
Signaling from the rnicromeres is involved (Kitazawa and Amemiya, 2007), and the gene nodal is expressed asymmetrically in the right side archenteron and right ectoderm of the gastrula (Duboc et al.