This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
Obturator nerve enters thigh at 
Select and explain. 
A. Adductor canal, B. Obturator canal, C. Superficial inguinal ring, D. Femoral canal
B: Obturator canal
Answer: B: Obturator canal 
Explanation: It descends through the fibers of the psoas major, and emerges from its medial border near the brim of pelvis; it then passes behind the common illaic aery and on the lateral side of the internal illiac aery and ureter, and runs along the lateral wall of the lesser pelvis, above and in front of the obturator vessel, to the upper pa of the obturator foramen. Here it enters the thigh, through the obturator canal, and divides into an anterior and a posterior branch, which are separated at first by some of the fibers of the obturator externus, and lower down by the adductor brevis. ref -sciencedirect.com