gastrulation

Examples of gastrulation in the following topics:

• Gastrulation

  • Gastrulation takes place after cleavage and the formation of the blastula and the primitive streak.
  • In amniotes such as humans, gastrulation occurs in the following sequence:
  • The molecular mechanism and timing of gastrulation is different in different organisms.
  • However, some common features of gastrulation across triploblastic organisms include:
  • Although gastrulation patterns exhibit enormous variation throughout the animal kingdom, they are unified by the five basic types of cell movements that occur during gastrulation:

• Neurulation

  • Following gastrulation, the neurulation process develops the neural tube in the ectoderm, above the notochord of the mesoderm.
  • It follows gastrulation in all vertebrates.
  • During gastrulation cells migrate to the interior of the embryo, forming the three germ layers: the endoderm (the deepest layer), the mesoderm (the middle layer), and the ectoderm (the surface layer) from which all tissues and organs will arise.
  • After gastrulation, the notochord—a flexible, rod-shaped body that runs along the back of the embryo—is formed from the mesoderm.

• Cleavage, the Blastula Stage, and Gastrulation

  • The cells in the blastula rearrange themselves spatially to form three layers of cells in a process known as gastrulation.
  • During gastrulation, the blastula folds upon itself to form the three layers of cells.
  • Describe the events that occur from the formation of a zygote to gastrulation

• Bilaminar Embryonic Disc Development

  • The formation of the bilaminar embryonic disc precedes gastrulation.
  • As gastrulation progresses, the embryonic disc becomes trilaminar and the notochord is formed.

• Embryonic Development of the Brain

  • It follows gastrulation in all vertebrates.
  • During gastrulation cells migrate to the interior of embryo, forming three germ layers— the endoderm (the deepest layer), mesoderm, and ectoderm (the surface layer)—from which all tissues and organs will arise.
  • After gastrulation, the notochord—a flexible, rod-shaped body that runs along the back of the embryo—has been formed from the mesoderm.

• Animal Reproduction and Development

  • Next, the blastula undergoes further cell division and cellular rearrangement during a process called gastrulation.
  • Different cell layers (called germ layers) are formed during gastrulation.
  • During a process called gastrulation, the blastula folds inward to form a cavity in the gastrula.

• Development of the Peripheral Nervous System

  • After gastrulation, neural crest cells are specified at the border of the neural plate and the non-neural ectoderm.

• Blastocyst Formation

  • Before gastrulation, the cells of the trophoblast become differentiated into two strata.

• Tissue Development

  • This early embryonic form undergoes gastrulation, forming a gastrula with either two or three layers (the germ layers).
  • During gastrulation, some of the cells migrating inward contribute to the mesoderm, an additional layer between the endoderm and the ectoderm.

• Development of Blood and Blood Vessels

  • Some researchers have found that cells with hemangioblast properties have been located in the posterior end of the primitive streak during gastrulation.