n. in embryology, refers to a single layer of cells formed after cleavage of the zygote or fertilized egg. Spherical in form, this cell layer (blastoderm) surrounds a fluid-filled cavity (blastocoele).
n. in embryology, refers to a single layer of cells formed after cleavage of the zygote or fertilized egg. Spherical in form, this cell layer (blastoderm) surrounds a fluid-filled cavity (blastocoele).