Wolffian duct

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Either of the pair of ducts that are present in a human embryo, alongside the pair of Müllerian ducts, and that develop into the male internal reproductive tract if embryonic testes are present and secrete testosterone and Müllerian inhibiting substance. In a female embryo the default development occurs: the Wolffian ducts atrophy and disappear because of the absence of testosterone, while in the absence of Müllerian inhibiting substance the Müllerian ducts develop into Fallopian tubes, uterus, and the upper part of the vagina. [Named after the German anatomist Kaspar Friedrich Wolff (1733–94)]

Subjects: Psychology.

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