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Uterus didelphys
Uterus didelphys (sometimes also ''uterus didelphis'') represents a uterine malformation where the uterus is present as a paired organ when the embryogenetic fusion of the Müllerian ducts fails to occur. As a result, there is a double uterus with two separate cervices, and often a double vagina as well. Each uterus has a single horn linked to the ipsilateral fallopian tube that faces its ovary.
In non human species (''e.g.'' nematodes), a didelphic genital tract may be normal rather than a malformation. Such species are described as didelphic, as opposed to monodelphic, with a single tract.
==Etiology==
The uterus is formed during embryogenesis by the fusion of the two paramesonephric ducts (also called Müllerian ducts). This process usually fuses the two Müllerian ducts into a single uterine body but fails to take place in these affected women who maintain their double Müllerian systems. A didelphic uterus will have a double cervix and is usually associated with a double vagina. The cause of the fusion failure is not known. Associated defects may affect the vagina, the renal system and, less commonly, the skeleton.
The condition is less common than these other uterine malformations: arcuate uterus, septate uterus, and bicornuate uterus. It has been estimated to occur in 1/3,000 women.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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