Upper three fouh of vagina is formed by?
Correct Answer: Sinovaginal bulb
Description: Sinovaginal bulbREF: Gray's anatomy 39th ed p-1385, Blueprints Obstetrics and Gynecology by Tamara L. Callahan, Aaron B. Caughey Page 140,Pediatric and adolescent gynecology by Marc R. Laufer, Donald Peter Goldstein Page 337See APPENDIX-5 for "Adult derivatives and vestigial remains of embryonic urogenital structures" Repeated in June 2011 andDecember 2011The sinovaginal bulb originates from urogenital sinus.Distally sinovaginal bulb and proximally overgrowth of Mullerian duct at Mullerian tubercle results in formation of vaginal plate which on canalization forms upper and lower vagina respectively.The first and second poions of Mullerian duct forms the fimbriae and the fallopian tubes while distal segment forms the uterus and upper vagina.Distal most poion of sinovaginal bulb forms the Hymen.
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