Gastrula
Gastrula
Gastrula (/ɡæˈstruːlə/; from the Greek γαστήρ gastēr 'stomach') is a stage in the embryonic development of animals. It is formed after the Blastula stage and is characterized by the invagination (infolding) of cells to form a three-layered structure known as the germ layers.
Etymology
The term 'Gastrula' comes from the Greek word 'gastēr', which means stomach. This is due to the similarity in shape between the gastrula and the stomach.
Description
The gastrula is a stage in the embryonic development of animals, following the Blastula stage. During gastrulation, the single-layered blastula is reorganized into a trilaminar (three-layered) structure known as the gastrula. These three germ layers are known as the Ectoderm, Mesoderm, and Endoderm.
The process of gastrulation varies among different groups of animals but usually involves the movement of cells from the surface of the embryo towards the center, forming a cup-like structure with a hollow interior. This process is known as invagination.
Related Terms
- Blastula: The stage of embryonic development that precedes the gastrula.
- Ectoderm: The outermost of the three germ layers formed in the gastrula stage.
- Mesoderm: The middle germ layer formed in the gastrula stage.
- Endoderm: The innermost of the three germ layers formed in the gastrula stage.
- Gastrulation: The process by which the gastrula is formed from the blastula.
See Also
External links
- Medical encyclopedia article on Gastrula
- Wikipedia's article - Gastrula
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