blas·to·disk or blas·to·disc (bl s t -d sk )n. 1. The disk of active cytoplasm at the animal pole of a telolecithal egg. 2. The blastoderm, especially in very early stages when its extent is small. |
blastodisk
[blas′tədisk]
the disklike, yolk-free area of cytoplasm surrounding the animal pole in a yolk-rich ovum, such as that of birds and reptiles. The blastodisk is the site where cleavage occurs after fertilization. As cleavage continues, the blastodisk develops into the embryo. Also spelled blastodisc.
blastodisk
the convex structure formed by the blastomeres at the animal pole of an ovum undergoing incomplete cleavage.
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