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The Wolffian duct is the urogenital duct of the adult, and the Mullerian duct is entirely absorbed, or remains, more or less, in exceptional cases.

In the female, the Mullerian duct increases greatly in length-- so that at sexual maturity its white coils appear thicker and longer than the intestine-- and becomes the oviduct; the Wolffian duct is the ureter, and the mesonephros is not perverted in function from its primary renal duty.

The latter is usually called the Mullerian duct, after its discoverer, Johannes Muller, while the former is called the Wolffian duct.

In all the Gnathostomes the Wolffian duct is converted into the spermaduct, and the Mullerian duct into the oviduct.

The origin of the Mullerian duct is still obscure; comparative anatomy and ontogeny seem to indicate that it originates by differentiation from the Wolffian duct.