noun Embryology.

  1. the primitive layer of cells that results from the segmentation of the ovum.
  2. the layer of cells forming the wall of the blastula, and in most vertebrates enclosing a cavity or a yolk mass.

noun embryol

  1. the layer of cells that surrounds the blastocoel of a blastula
  2. a flat disc of cells formed after cleavage in a heavily yolked egg, such as a bird’s egg


  1. 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.germinal membrane germ membrane
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