blastoderm /blas·to·derm/ (-derm) the single layer of cells forming the wall of the blastula, or the cellular cap above the floor of segmented yolk in the discoblastula of telolecithal eggs.blastoder´malblastoder´mic
blastoderm
blas·to·derm (bl s t -dûrm ) or blas·to·der·ma (blst-dûrm)n. The layer of cells formed by the cleavage of a fertilized mammalian egg, which later divides into the three germ layers from which the embryo develops. Also called germinal membrane, germ membrane. blas to·dermal, blasto·dermic, blasto·der·matic (-dr-mt k) adj. |
blastoderm
[blas′tədurm′]
Etymology: Gk, blastos + derma, skin
the layer of cells forming the wall of the blastocyst in mammals and the blastula in lower animals during the early stages of embryonic development. It is produced by the cleavage of the fertilized ovum and gives rise to the primary germ layers, the ectoderm, mesoderm, and endoderm, from which the embryo and all of its membranes are derived. Kinds of blastoderm are bilaminar blastoderm, embryonic blastoderm, extraembryonic blastoderm, and trilaminar blastoderm. Also called germinal membrane. blastodermal, blastodermic, adj.
blastoderm
the layer of cells forming the wall of the blastula.
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