gastrula

(noun)

A stage in the development of embryos of most animals consisting of a two-layered sac of ectoderm and endoderm.

Related Terms

  • neural groove
  • differentiation

Examples of gastrula in the following topics:

  • Gastrulation

    • Gastrulation is a phase early in the embryonic development of most animals during which the single-layered blastula is reorganized into a trilaminar (three-layered) structure known as the gastrula.
  • Tissue Development

    • This early embryonic form undergoes gastrulation, forming a gastrula with either two or three layers (the germ layers).
    • Cells migrating inward along the primitive gut form the inner layer of the gastrula, which develops into the endoderm.
  • Development of Nervous Tissue

    • All bilaterian animals at an early stage of development form a gastrula, which is polarized, with one end called the animal pole and the other the vegetal pole.
    • The gastrula has the shape of a disk with three layers of cells, an inner layer called the endoderm, which gives rise to the lining of most internal organs, a middle layer called the mesoderm, which gives rise to the bones and muscles, and an outer layer called the ectoderm, which gives rise to the skin and nervous system.
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