the part of a fertilized ovum that gives rise to the germinal disk from which the embryo develops
Origin of blastodermblasto- + -derm
- The layer of cells that develops on the surface of the yolk in an avian or reptilian egg and gives rise to the germinal disk from which the embryo develops.
- The layer of cells formed by the cleavage of a fertilized mammalian egg. It later divides into the three germ layers from which the embryo develops.
- blas′to·der·mat′ic , blas′to·der′mic
- (embryology) The germination point in an ovum from whence the embryo develops.