This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Back, Deltoid, and Scapular Region, Subject name: Anatomy
Serratus anterior is supplied by which nerve? 
Select and explain. 
A. Long thoracic nerve, B. Spinal accessory nerve, C. Dorsal scapular nerve, D. Axillary nerve
A: Long thoracic nerve
Answer: A: Long thoracic nerve 
Explanation: ANSWER: (A) Long thoracic nerveREF: Gray s anatomy 40th ed chapter 46Serratus anterior is innervated by the long thoracic nerve, C5, 6 and 7, which descends on the external surface of the muscle.