Gastrula kalma ce da ake amfani da ita a ilimin mahaifa don nufin wani mataki na ci gaban amfrayo na dabba. Yana da mataki bayan matakin blastula kuma yana da alaƙa da samuwar nau'ikan ƙwayoyin cuta guda uku - ectoderm, endoderm, da mesoderm. Ectoderm yana haifar da fata da tsarin juyayi, endoderm yana haifar da hanji da gabobin da ke hade, kuma mesoderm yana haifar da tsoka, kashi, da kwayoyin jini. Samuwar wadannan nau'ikan kwayoyin cuta wani muhimmin mataki ne wajen samar da hadaddun kwayoyin halitta masu yawa.