What is "blastoderm"

Blastoderm \Blas"to*derm\, n. [Gr. blasto`s sprout + E. derm.] (Embryology) the early stage of an embryo after the first cleavages of the ovum; also, the layer of cells of which the early embryo is composed; specifically:

1. the early embryo developing from a blastodisc, after the blastocoel has formed.

2. in an insect embryo, the layer of cells that surrounds the internal mass of the yolk.

n. (context embryology English) The germination point in an ovum from whence the embryo develops.

n. a layer of cells on the inside of the blastula [syn: germinal disc, blastodisc, germinal area]

The blastoderm is a term for cell layers found in blastulas.