The Wolffian ducts, also known as mesonephric ducts, are paired structures in the early development of vertebrate embryos. They play a crucial role in the formation of the male reproductive system, eventually developing into structures such as the epididymis, vas deferens, and seminal vesicles. In females, the Wolffian ducts typically regress and do not contribute to the reproductive system. Instead, the Müllerian ducts, which develop alongside the Wolffian ducts, give rise to the fallopian tubes, uterus, and vagina. The presence and development of these ducts are influenced by genetic and hormonal factors during embryonic development.