This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve supply, Nerve Lesions, Subject name: Anatomy
Root value of radial nerve is: 
Select and explain. 
A. C3,4,5,6,7, B. C4,5,6,7,8, C. C5,6,7,8; T1, D. C6,7,8; T1,2
C: C5,6,7,8; T1
Answer: C: C5,6,7,8; T1 
Explanation: Radial nerve is the continuation of posterior cord. Root value of posterior cord is C5,6,7,8 ,T1 (has 5 root values) Posterior cord is formed by posterior divisions of upper, middle and lower trunks. It supplies posterior compament of upper limb.