Blastoderm
Blastoderm
Blastoderm (pronounced: /ˈblæstəˌdɜːrm/) is a term used in Embryology to describe the layer of cells formed at one pole of the ovum following fertilization.
Etymology
The term 'Blastoderm' is derived from the Greek words 'blastos' meaning 'sprout' and 'derma' meaning 'skin'.
Definition
A Blastoderm is a cellular layer that forms on the surface of the yolk in the eggs of birds and reptiles. In mammals, it is the layer of cells that forms on the surface of the Blastocyst after fertilization.
Related Terms
- Blastocyst: A structure formed in the early development of mammals, after the formation of the blastoderm. It possesses an inner cell mass (ICM) which subsequently forms the embryo.
- Embryo: An early stage of development of a multicellular organism. In humans, it is the stage of development from the first division of the zygote until the end of the eighth week of gestation.
- Zygote: The cell formed by the union of two gametes; the fertilized ovum before first cell division.
- Ovum: The female reproductive cell or gamete of animals, which is capable of developing, usually only after fertilization, into a new individual.
See Also
External links
- Medical encyclopedia article on Blastoderm
- Wikipedia's article - Blastoderm
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