All of the following are components of vaginal sphincter, EXCEPT?: (A) External urethral sphincter, (B) Internal urethral sphincter, (C) Bulbospongiosus, (D) Pubovaginalis
Answer is B. Four muscles compress the vagina and act as sphincters:PubovaginalisExternal urethral sphincterUrethrovaginal sphincterBulbospongiosus