noun
- the most anterior of the three pairs of embryonic kidneys in vertebrates, functioning as the primary excretory organ in some lower vertebrates and embryos
Usage: anatomy; embryology
Examples
- The pronephros develops first during embryonic kidney formation.
- In fish larvae, the pronephros serves as the functional kidney.
- The pronephros is replaced by the mesonephros in higher vertebrates.
- Researchers studied pronephros development in zebrafish embryos.
- The pronephros consists of tubules that filter waste from the blood.
- Amphibian tadpoles rely on their pronephros for excretion.