A lesion involving C8 nerve root will affect:
C8 nerve root supplies -1. Wrist (and Finger) flexors and2. Small muscles of hand Note: Small muscles of hand are supplied by C8; T1, More precisely T1. Supinators - C6 Wrist (and Finger) extensors--C6(7) Wrist (and Finger) flexors--C7(8) Intrinsic muscles of hand--C8; T1
Extensors of wrist and fingers
Flexors of wrist and fingers
Small muscles of hand
Supinators
Nerve supply, Nerve Lesions