Anatomy Upper limb 87c6304c Dermatome in the thumb and index finger region is supplied by A C5,C6 B C6,C7 C C7,C8 D C8,T1 High-Yield Explanation -Thumb C6, index finger -C7 -reference: Textbook of anatomy ,Upper limb and thorax,Vishram Singh, 2nd edition, page no.85,86