Mesonephros
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| Mesonephros | ||
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| Reconstruction of a human embryo of 17 mm. (Label for Mesonephros is at center right.) | ||
| Gray's | subject #252 1205 | |
| Carnegie stage | 14 | |
| Precursor | intermediate mesoderm | |
| MeSH | A16.254.500 | |
| Dorlands/Elsevier | m_11/12527308 | |
The mesonephros (Latin for "middle kidney") 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 higher vertebrates. The mesonephros is also called the Wolffian body after Caspar Friedrich Wolff who described it in 1759.
The mesonephros is composed of the mesonephric duct (also called the Wolffian duct), mesonephric tubules, and associated capillary tufts. A single tubule and its associated capillary tuft is called a mesonephric excretory unit; these units are similar in structure and function to nephrons of the adult kidney. The mesonephros is derived from intermediate mesoderm in the vertebrate embryo.
In human males, the mesonephros gives rise to the efferent ductules of the testis, the epididymis, vas deferens, seminal vesicle, and vestigial structures such as the appendix testis, appendix epididymis, and paradidymis. The mesonephros largely regresses in human females, though vestigial structures such as Gartner's cysts, the epoophoron, and paroophoron are common.
[edit] Additional images
 Broad ligament of adult, showing epoöphoron. |
 Longitudinal section of ovary of cat embryo of 9.4 cm. long. |
