blastula

1. Early stage of an embryo produced by cleavage of an ovum;
   A liquid-filled sphere whose wall is composed of a single layer of cells;
   During this stage (about eight days after fertilization) implantation in the wall of the uterus occurs (synset 101464287)
   is a type of: conceptus, embryo, fertilized egg - an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life
   subtypes: blastocyst, blastodermic vessicle - the blastula of a placental mammal in which some differentiation of cells has occurred
   has:

   • blastocele, blastocoel, blastocoele, cleavage cavity, segmentation cavity - the fluid-filled cavity inside a blastula
   • trophoblast - the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall
   same as: blastosphere

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