Blastula
Blastula
The Blastula (/blæˈstjuːlə/; from Greek βλαστός (blastos) meaning "sprout") is a stage in the embryonic development of multicellular organisms. It is typically characterized by a sphere of cells, known as blastomeres, surrounding a fluid-filled cavity called the blastocoel.
Etymology
The term "Blastula" is derived from the Greek word βλαστός (blastos), which translates to "sprout". This is in reference to the sprouting or budding nature of the cells during this stage of development.
Structure
The Blastula is composed of a single layer of cells, known as the blastoderm, which surrounds a central cavity, the blastocoel. These cells, or blastomeres, are the result of the early divisions of the fertilized egg, or zygote.
Development
The formation of the Blastula, a process known as blastulation, follows the stage of the morula in embryonic development. The blastomeres undergo rapid mitotic divisions, a process known as cleavage, to form a hollow sphere of cells. This sphere then undergoes gastrulation, transforming into the gastrula.
Related Terms
- Blastomere: The cells that make up the blastula.
- Blastocoel: The fluid-filled cavity within the blastula.
- Blastoderm: The layer of cells that forms the outer wall of the blastula.
- Blastulation: The process by which a morula develops into a blastula.
- Gastrula: The stage of embryonic development that follows the blastula.
- Morula: The stage of embryonic development that precedes the blastula.
- Zygote: The fertilized egg that undergoes cleavage to form the blastula.
External links
- Medical encyclopedia article on Blastula
- Wikipedia's article - Blastula
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