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Blastoderm


Blastoderm
[Gr. blastos - germ, bud, shoot; Gr. derma - skin]. The divided germinal disc of a megalecithal egg lying on the yolk and composed of three regions: the area pellucida, the area opaca, and the syncytial periblast. Synonym: blastodisc.
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blastoderm - cell layer formed during cleavage of telolecithal and centrolecithal eggs.
blastomere - any cell formed during cleavage.
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blastoderm
The layer of cells formed by cleavage of the fertilized egg in the presence of large amounts of yolk.
Covered in Lab 14 Gametogenesis and Development ...
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blastoderm "Primary epithelium" formed in early embryonic development of many arthropods when the nuclei migrate to the periphery and undergo superficial cleavage; usually encloses the central yolk mass.
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In the blastoderm stage of Drosophila morphogenesis four types of nuclear specification can be distinguished:
Anterior (head and thorax)
Posterior (abdomen)
Dorso-ventral
Terminal (special structures at the unsegmented ends of the embryo) ...
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Ci protein first appears dorsally in the cellular blastoderm of embryos (Fig 1A). (Motzny, 1995).
The expression domain expands throughout the cellularized embryo and remains uniform up to germ band extension (stage 8).
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The blastoderm stage of the embryo is a syncytium (thousands of nuclei unconfined by cells) so that, for example, macromolecules like DNA injected into the embryo have easy access to all the nuclei.
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