Development of The Reproductive System - The Müllerian (paramesonephric) Duct

The Müllerian (paramesonephric) Duct

Shortly after the formation of the Wolffian ducts a second pair of ducts is developed; these are the Müllerian ducts. Each arises on the lateral aspect of the corresponding Wolffian duct as a tubular invagination of the cells lining the abdominal cavity. The orifice of the invagination remains open, and undergoes enlargement and modification to form the abdominal ostium of the fallopian tube. The ducts pass backward lateral to the Wolffian ducts, but toward the posterior end of the embryo they cross to the medial side of these ducts, and thus come to lie side by side between and behind the latter—the four ducts forming what is termed the common genital cord, to distinguish it from the genital cords of the germinal epithelium seen later in this article. The Müllerian ducts end in an epithelial elevation, the Müllerian eminence, on the ventral part of the cloaca between the orifices of the Wolffian ducts. At a later stage the eminence opens in the middle, connecting the Müllerian ducts with the cloaca.

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Development Of The Reproductive System - The Müllerian (paramesonephric) Duct - Development in Females
... In the female the Müllerianducts persist and undergo further development ... This fusion of the Müllerianducts begins in the third month, and the septum formed by their fused medial walls disappears from below upward ... The hymen represents the remains of the Müllerianeminence ...