blastodisk


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Related to blastodisk: blastoderm

blastodisk

or

blastodisc

(blăs′tə-dĭsk′)

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

(blăs′tō-dĭsk) [″ + diskos, disk]
A flat disk of embryonic cells on the surface of the yolk of the ovum. It forms from the blastomeres.

blastodisk

the convex structure formed by the blastomeres at the animal pole of an ovum undergoing incomplete cleavage.