This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Structure passing through both greater and lesser sciatic foramen is ? 
Select and explain. 
A. Pudendal nerve, B. Sciatic nerve, C. Superior gluteal nerve, D. Inferior gluteal nerve
A: Pudendal nerve
Answer: A: Pudendal nerve 
Explanation: Ans. is 'a' i.e., Pudendal nerve Three structures pass through both greater and lesser sciatic foramen :- Pudendal nerve Internal pudendal vessels Nerve to obturator internus Structure passing throught greater sciatic foramen Piriformis fills the foramen almost completely Structures passing above the piriformis Superior gluteal nerve Superior gluteal vessels Structures passing below the piriformis Inferior gluteal nerve Inferior gluteal vessel. Sciatic nerve Posterior cutaneous nerve of thigh Nerve to quadratus femoris Pudendal nerve Internal pudendal vessels Nerve to obturator internus Note : Last three structures also enter the lesser sciatic foramen. Structures passing through lesser sciatic foramen Pudendal nerve Internal pudendal vessels Nerve to obturator internus