Definition of blastoderm in English:



  • 1The layer of embryonic tissue that forms prior to the development of the embryonic axis.

    • ‘Apparently, there is little similarity between the simultaneous subdivision of the blastoderm into parasegments seen in Drosophila and the posterior addition of segments from a sub-terminal growth zone seen in many crustaceans.’
    • ‘We examined Fumble staining during the mitotic divisions of the cellular blastoderm.’
    • ‘In the fruit fly, segments are genetically delimitated early and simultaneously, when the embryo still is a blastoderm and the process of segmentation does not involve somites.’
    • ‘Early development is essentially two-dimensional; patterning occurs mainly in the blastoderm, the superficial layer of the embryo that consists first of nuclei and later of cells.’
    1. 1.1 The outer layer of cells that forms the wall of a blastula.
      • ‘As a result, the blastodisc on the yolk becomes a blastoderm.’
      • ‘When the egg is laid, the blastoderm contains several hundred cells.’
      • ‘Pole cells cease dividing after the formation of the cellular blastoderm.’
      • ‘At cellular blastoderm most of the EAR protein is associated with cells at the periphery, while some protein is still associated with yolk nuclei.’
      • ‘When the membranes surrounding the peripheral nuclei fuse to form the 6000 cells of the cellular blastoderm, they enclose 175-225 polyploid yolk nuclei within a large syncytial yolk cell.’