Root value of radial nerve is:: (A) C3,4,5,6,7, (B) C4,5,6,7,8, (C) C5,6,7,8; T1, (D) C6,7,8; T1,2
Answer is C. 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.