Hypoblast
Hypoblast
Hypoblast (pronounced: /ˈhaɪpəˌblæst/) is a term used in embryology to refer to the inner layer of cells in the blastocyst, which later develops into the endoderm and contributes to the formation of the gastrointestinal tract, the respiratory tract, and several other internal organs.
Etymology
The term "hypoblast" is derived from the Greek words "hypo" meaning "under" or "beneath", and "blastos" meaning "germ" or "sprout". Thus, the term literally translates to "under germ" or "under sprout", referring to its position beneath the epiblast in the early stages of embryonic development.
Related Terms
- Blastocyst: A structure formed in the early development of mammals, which possesses an inner cell mass (ICM) from which the embryo arises. The outer layer of the blastocyst consists of cells collectively called the trophectoderm.
- Epiblast: The outermost layer of an embryo's blastula, which forms the ectoderm and contributes to the formation of many tissues and organs.
- Endoderm: The innermost layer of the cells or tissue of an embryo in early development, or the parts derived from this, which include the lining of the gut and associated structures.
- Gastrulation: A phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula.
See Also
External links
- Medical encyclopedia article on Hypoblast
- Wikipedia's article - Hypoblast
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