This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
Not a branch of posterior cord of Brachial plexus 
Select and explain. 
A. Axillary nerve, B. Thoracodorsal nerve, C. Radial nerve, D. Ulnar nerve
D: Ulnar nerve
Answer: D: Ulnar nerve 
Explanation: Long thoracic nerve arises from the nerve root of C5-C7 and it supplies serratus anterior muscle. The axillary nerve supplies the deltoid and teres minor muscles. The thoracodorsal nerve supplies the latissimus dorsi muscle. The radial nerve supplies 3 heads of triceps brachii and 12 muscles on the back of the forearm. Mnemonic Posterior cord - ULTRA U- upper subscapular nerve L-lower subscapular nerve T-thoracodorsal R-radial nerve A-axillary nerve B D Chaurasia 7th edition Page no: 58 Fig: 4.14,page no:55 BD chaurasia 6th edition.