blastula

Examples of blastula in the following topics:

• Cleavage, the Blastula Stage, and Gastrulation

  • After the cleavage has produced over 100 cells, the embryo is called a blastula.
  • Each cell within the blastula is called a blastomere.
  • In mammals, the blastula forms the blastocyst in the next stage of development.
  • The typical blastula is a ball of cells.
  • During gastrulation, the blastula folds upon itself to form the three layers of cells.

• Animal Reproduction and Development

  • After further cell division and rearrangement of existing cells, a 6–32-celled hollow structure called a blastula is formed.
  • Next, the blastula undergoes further cell division and cellular rearrangement during a process called gastrulation.
  • During embryonic development, the zygote undergoes a series of mitotic cell divisions, or cleavages, to form an eight-cell stage, then a hollow blastula.
  • During a process called gastrulation, the blastula folds inward to form a cavity in the gastrula.

• Cellular Differentiation

  • A pathway that is guided by the cell adhesion molecules is created as the cellular blastomere differentiates from the single-layered blastula to the three primary layers of germ cells in mammals, namely the ectoderm, mesoderm and endoderm (listed from most distal, or exterior, to the most proximal, or interior).

• Phylum Cnidaria

  • After fertilization, the zygote develops into a blastula and then into a planula larva.

• Animal Characterization Based on Features of Embryological Development

  • Each of the three germ layers in a blastula, or developing ball of cells, becomes particular body tissues and organs.