#conceptus__conceptu__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
  supertype:  #animal__animate_being__animatebeing__beast__brute__creature__fauna  a living organism characterized by voluntary movement
  part:  #umbilical_cord
  subtype:  #blastula__blastodermic_vesicle  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
     subtype:  #blastosphere__blastocyst  the blastula of mammals
  subtype:  #gastrula  double-walled stage of the embryo succeeding the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
  subtype:  #morula  a solid mass of blastomeres that forms when the zygote splits; develops into the blastula

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