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: Surgery
The skin overlying the region where a venous "cut down" is made to access the great saphenous vein is supplied by 
Select and explain. 
A. Femoral nerve, B. Tibal nerve, C. Sural nerve, D. Superficial perineal nerve
A: Femoral nerve
Answer: A: Femoral nerve 
Explanation: (Femoral nerve) * Great saphenous vein lies in the medial side of the leg and thigh, it is the MC site of venous cut down * It is accompanied by saphenous nerve all along, the nerve which supplies the medial aspect of the leg and dorsum of the foot till the ball of great toe. * Saphenous nerve itself is a branch of femoral nerve and can get damaged during venesection of great saphenous. * The skin over the medial thigh is mainly supplied by the medial cutaneous branch of femoral nerve. * Sural nerve is actually a branch of tibial nerve and supplies the lateral side of the lower leg and lateral dorsum of the foot (little toe). * Superficial peroneal nerve supplies skin on the lateral aspect of the leg and most of the dorsum of the foot. * Deep peroneal nerve supplies the 1st web-space on the dorsum of the foot.