Intermediate mesoderm
Intermediate Mesoderm
Intermediate mesoderm (pronunciation: /ˌɪntərˈmiːdiət ˈmɛzədɜːrm/) is a type of mesoderm that appears in the embryo during the third week of embryogenesis. It is located between the paraxial mesoderm and the lateral plate mesoderm.
Etymology
The term "intermediate mesoderm" is derived from the Latin words "intermedius" meaning "middle" and "mesoderm" meaning "middle skin". This is in reference to its position in the developing embryo.
Function
The intermediate mesoderm gives rise to the urogenital system, which includes the kidneys, ureters, gonads, and their associated ducts.
Development
During the third week of embryogenesis, the intermediate mesoderm differentiates into a longitudinal ridge known as the urogenital ridge. This ridge further differentiates into the nephrogenic cord, which will eventually form the urinary system, and the gonadal ridge, which will form the gonads.
Related Terms
- Mesoderm: One of the three primary germ layers in the early embryo.
- Paraxial mesoderm: The part of the mesoderm that lies alongside the neural tube and gives rise to the somites.
- Lateral plate mesoderm: The part of the mesoderm that lies at the periphery of the embryo and gives rise to the circulatory system, spleen, and adrenal cortex.
- Urogenital system: The organ system of the reproductive organs and the urinary system.
- Nephrogenic cord: A structure formed from the intermediate mesoderm that gives rise to the urinary system.
- Gonadal ridge: A structure formed from the intermediate mesoderm that gives rise to the gonads.
External links
- Medical encyclopedia article on Intermediate mesoderm
- Wikipedia's article - Intermediate mesoderm
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