胚盘
Blastoderm \Blas"to*derm\, n. [Gr. blasto`s sprout + E. derm.] (Biol.) The germinal membrane in an ovum, from which the embryo is developed.
blastoderm n : a layer of cells on the inside of the blastula [syn: {germinal disc}, {blastodisc}, {germinal area}]