This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bones Joints and Ligaments, Subject name: Anatomy
Structure passing through both greater and lesser sciatic foramen are all EXCEPT: 
Select and explain. 
A. Pudendal Nerve, B. Internal Pudendal Vein, C. Nerve to Obturator Internus, D. Tendon of Obturator Internus
D: Tendon of Obturator Internus
Answer: D: Tendon of Obturator Internus 
Explanation: PIN (Pudendal nerve, Internal pudendal vessels and Nerve to obturator internus) structures come from pelvic cavity, pass through the Greater Sciatic Notch, hook behind the Ischial Spine (in Gluteal Region) and move into the Lesser Sciatic Notch. The Tendon (and not muscle) of Obturator Internus passes through the Lesser Sciatic Notch.