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
[{'content': 'The skin overlying the region where a venous "cut down" is made to access the great saphenous vein is supplied by \nSelect and explain. \nA. Femoral nerve, B. Tibal nerve, C. Sural nerve, D. Superficial perineal nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (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.', 'role': 'assistant'}]