Archenteron


Archenteron

The primitive gut that forms during gastrulation in the developing blastula is known as the archenteron. It develops into the digestive tract of an animal.

Formation of the Archenteron

[See Gastrulation]

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 amphibians and fish, and the "primitive streak" in birds and mammals. Each is controlled by the dorsal blastopore, and primitive node, respectively.

External links

* [http://chsweb.lr.k12.nj.us/mstanley/outlines/animals/antax/image51.gifDiagram]


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  • archentéron — ● archentéron nom masculin Cavité embryonnaire de la gastrula, dont l orifice est le blastopore. (L archentéron deviendra le tube digestif de l adulte.) ⇒ARCHENTÈRE, ARCHENTÉRON, subst. masc. EMBRYOL. ,,Intestin embryonnaire qui naît au stade… …   Encyclopédie Universelle

  • Archenteron — Archentéron L archentéron est le nom donné à l intestin primitif, c est à dire à la première cavité qui traverse l embryon en cours de développement tout en étant ouverte sur l extérieur. Formé au cours de la gastrulation, il est entouré de l… …   Wikipédia en Français

  • Archenteron — Arch en ter*on, n. [Pref. arch + Gr. ? intestine.] (Biol.) The primitive enteron or undifferentiated digestive sac of a gastrula or other embryo. See Illust. under {Invagination}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Archentĕron — (griech.), Urdarmhöhle, s. Entwickelungsgeschichte …   Meyers Großes Konversations-Lexikon

  • archenteron — [är ken′tər än΄] n. [ ARCH + Gr enteron, intestine] the cavity at the center of an embryo in the gastrula stage of development, forming a primitive digestive tract archenteric [är΄kən ter′ik] adj …   English World dictionary

  • Archentéron — L archentéron est le nom donné à l intestin primitif, c est à dire à la première cavité qui traverse l embryon en cours de développement tout en étant ouverte sur l extérieur. Formé au cours de la gastrulation, il est entouré de l endoderme… …   Wikipédia en Français

  • Archenteron — pirminis žarnynas statusas T sritis embriologija atitikmenys: lot. Archenteron ryšiai: platesnis terminas – gastrulės susidarymas siauresnis terminas – gemaliniai sluoksniai …   Medicininės histologijos ir embriologijos vardynas

  • archenteron — noun Etymology: New Latin Date: 1877 the cavity of a gastrula forming a primitive gut …   New Collegiate Dictionary

  • archenteron — n. [Gr. arche, beginning; enteron, intestine] The primitive digestive cavity of many invertebrates, formed by gastrulation; the gastrocoele; precursor to the gut …   Dictionary of invertebrate zoology

  • archenteron — archenteric /ahr keuhn ter ik/, adj. /ahr ken teuh ron /, n., pl. archentera / teuhr euh/. Embryol. the primitive enteron or digestive cavity of a gastrula. Also called primitive gut. [1875 80; ARCH 2 + ENTERN] * * * …   Universalium


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