The vagina has a dual embryological origin. Which statement correctly describes the origin of the hymen?
- A It lies at the junction of the paramesonephric-derived upper vagina and the urogenital sinus-derived lower vagina ✓
- B It is derived entirely from the fused paramesonephric ducts
- C It is a remnant of the mesonephric duct opening into the urogenital sinus
- D It forms from the Mullerian tubercle alone after canalisation
Correct answer: A. It lies at the junction of the paramesonephric-derived upper vagina and the urogenital sinus-derived lower vagina
Explanation
The upper vagina and fornices come from the fused paramesonephric ducts, while the lower vagina forms from the sinovaginal bulbs of the urogenital sinus. The hymen marks the junction between these two origins. This dual origin explains why isolated vaginal atresia can affect either segment depending on which structure fails. The mesonephric duct contributes to the male system and degenerates in females, and the Mullerian tubercle alone does not form the hymen.
Reference: Langman's Medical Embryology, 14th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.