Blastopore

Blastopore

Infobox Embryology
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A blastopore is an opening into the archenteron during the embryonic stages of an organism. The distinction between protostomes and deuterostomes is based on the direction in which the mouth (stoma) develops in relation to the blastopore. Protostome derives from the Greek word protostoma meaning "first mouth"(πρώτος + στόμα) whereas Deuterostome's etymology is "second mouth" from the words second and mouth (δεύτερος + στόμα).

The major distinctions between deuterostomes and protostomes are found in embryonic development:

* Mouth/anus
** In protostome development, the first opening in development, the blastopore, becomes the animal's mouth.
** In deuterostome development, the blastopore becomes the animal's anus.

* Cleavage
** Protostomes have what is known as "spiral cleavage" which is "determinate", this meaning that the fate of the cells is determined as they are formed.
** Deuterostomes have what is known as "radial cleavage" that is "indeterminate".

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  • BLASTOPORE — Lors de l’embryogenèse animale, au cours de la gastrulation, et au moment où s’invagine le pôle végétatif de la cœloblastula, il se produit une ouverture: c’est le blastopore. Celui ci donne accès à la cavité archentérique située dans le sac… …   Encyclopédie Universelle

  • Blastopore — Blas to*pore, n. [Gr. blasto s sprout + E. pore.] (Biol.) The pore or opening leading into the cavity of invagination, or archenteron. Note: [See Illust. of {Invagination}.] Balfour. [1913 Webster] …   The Collaborative International Dictionary of English

  • blastopore — [blas′tō pôr΄, blas′təpôr΄] n. [ BLASTO + PORE2] the opening into the gastrula cavity …   English World dictionary

  • blastopore — During gastrulation cells on the surface of the embryo move into the interior to form the mesoderm and endoderm. The opening formed by this invagination of cells is the blastopore. It is an opening from the archenteron, the primitive gut, to the… …   Dictionary of molecular biology

  • Blastopore — Le blastopore est l orifice de la blastula faisant communiquer l’archentéron avec l’extérieur. Il résulte de l’invagination du matériel superficiel lors de la gastrulation et constituera d abord l’anus chez les deutérostomiens et d abord la… …   Wikipédia en Français

  • blastopore — noun Date: 1880 the opening of the archenteron • blastoporic adjective …   New Collegiate Dictionary

  • blastopore — a circular area on the yolk of Teleostei eggs not covered by the advancing germ ring during epiboly …   Dictionary of ichthyology

  • blastopore — n. [Gr. blastos, bud; poros, passage] The mouthlike opening from the archenteron to the exterior during the gastrula stage of development …   Dictionary of invertebrate zoology

  • blastopore — blastoporic /blas teuh pawr ik, por /, blastoporal /blas teuh pawr euhl, pohr /, adj. /blas teuh pawr , pohr /, n. Embryol. the opening of an archenteron. [1875 80; BLASTO + pore passage; see PORE2] * * * ▪ anatomy       the opening by which the… …   Universalium

  • blastopore — noun The opening into the archenteron …   Wiktionary

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