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Figure 1. Development of the uterovaginal canal. Two paired müllerian ducts (yellow lines) grow medially and caudad. Both ducts fuse in the midline to form the uterus and the upper two-thirds of vagina (lateral fusion). The lower third of vagina is formed by fusion of the ascending sinovaginal bulb (red lines) with the müllerian system (vertical fusion). The septum disappears, leaving a single uterovaginal canal.
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