page_title: Mesonephros
section_title: Other animals
hierarchical_section_title: Mesonephros / Other animals
caption_attribution_description: Section of the urogenital fold of a chick embryo of the fourth day. (Waldeyer.). This fold in the mesonephros, however, shouldn't be confused with the present day meaning of w:urogenital fold
context_page_description: The mesonephros is one of three excretory organs that develop in vertebrates. It serves as the main excretory organ of aquatic vertebrates and as a temporary kidney in reptiles, birds, and mammals. The mesonephros is included in the Wolffian body after Caspar Friedrich Wolff who described it in 1759.
context_section_description: The mesonephros persists and forms the anterior portion of the permanent kidneys in fish and amphibians, but in reptiles, birds, and mammals, it atrophies and for the most part disappears rapidly as the permanent kidney (metanephros) begins to develop during the sixth or seventh week. By the beginning of the fifth month of human development, only the ducts and a few of the tubules of the mesonephros remain.
caption: Section of the fold in the mesonephros of a chick embryo of the fourth day. Wolffian tubules are labeled to the right.
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