Periblastula

periblastula

[¦per·ə′blas·tyə·lə]
(embryology)
The blastula of a centrolecithal egg, formed by superficial segmentation.

Periblastula

 

a stage in the embryonic development of most arthropods having centrolecithal eggs. The periblastula is a vesicle whose wall consists of one layer of cells and whose cavity is filled with unbroken yolk. It forms as a result of the superficial segmentation of the egg.