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corion ( approfondimento) m
- (biologia) È la parte più esterna dell'embrione, costituito da uno strato ectodermico esterno e da uno strato mesodermico interno, che racchiude l'embrione dei rettili, degli uccelli e dei mammiferi; in questi ultimi entra in rapporto con l'allantoide per formare la placenta.
membrana coriale, sacco coriale
Deriva dal greco chòrion = placenta, membrana, pelle
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