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Gastrulė

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Gastrulė – dvisluoksnis darinys, kuris susidaro iš blastulės.

1. Blastulė, 2. Gastrulė, oranžinė – ektoderma, raudona – endoderma.

Gastruliacija – procesas, kurio metu blastulė virsta gastrule. T.y., viengubasienio rutuliuko virtimas dvigubasieniu. Išorinis sluoksnis vadinamas ektoderma, vidinis – endoderma

Yra žinomi šeši gastruliacijos būdai:

  • ingresija – vidun įslįsta pavienės ląstelės
  • involiucija – ektodermos įsisukimas į endodermą
  • invaginacija (įdubimas) – vegetacinio poliaus ląstelės įdumba, sudarydamos entodermą. Animalinio poliaus ląstelės lieka išorėje ir tampa ektoderma.
  • delaminacija (susisluoksniavimas) – sienelės ląstelės dalijasi į du sluoksnius (vidinis – endoderma, išorinis – ektoderma)
  • epibolija (apaugimas) – smulkios ląstelės (animalinis polius) intensyviai dalinasi ir iš išorės apauga stambesnes ląsteles (vegetacinis polius). Smulkiosios tampa ektoderma, stambiosios – entoderma. Būdingas kai kurioms kirmėlėms, kai kuriems moliuskams.

Pasibaigus gastruliacijai prasideda organogenezė.


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