Embryos
Embryo
Embryo (/ˈɛmbri.oʊ/; from Greek ἔμβρυον, embrion) is a term used in Biology and Medicine to refer to the early developmental stage of an organism following fertilization and before it is considered a Fetus.
Etymology
The term "Embryo" originates from the Greek word ἔμβρυον (embrion), which means "young one". This term was first used in the English language in the mid-16th century.
Definition
An Embryo is the stage in the life cycle of a Multicellular organism that occurs after fertilization and before the organism is considered a Fetus. In humans, this stage typically lasts from the second to the eighth week of Pregnancy.
Related Terms
- Blastocyst: A structure formed in the early development of mammals, before it develops into an Embryo.
- Zygote: The cell resulting from the fusion of two Gametes; the earliest stage of an Embryo.
- 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.
- Organogenesis: The phase of embryonic development that follows gastrulation and leads to the formation of distinct organs.
See Also
External links
- Medical encyclopedia article on Embryos
- Wikipedia's article - Embryos
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