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
Nerve supply of the skeletal muscles element of diaphragm is 
Select and explain. 
A. Thoracodorsal nerve, B. Intercostal nerves, C. Phrenic nerve, D. Long thoracic nerve
C: Phrenic nerve
Answer: C: Phrenic nerve 
Explanation: Phrenic nerve Phrenic nerve is the sole motor nerve supply to diaphragm. Under the influence of phrenic nerve input, the diaphragm contributes more than any other muscle to inspiration. With deeper respiration, there is more extensive descent of the domes which brings them inferior to the central tendon.