Table 1: Spinal nerve roots and related upper extremity function [1].

Function	Brachial Plexus (BP) Spinal Nerve Root
Shoulder	Abduction - external rotation	Adduction - internal rotation
Shoulder	C5, C6	C5-Th1
Elbow	Flexion	Extension
Elbow	C5, C6	C6, C7, C8
Wrist	Supination	Extension
	C5, C6	C5, C6, C7
	Radial inclination	Flexion
	C5, C6, C7	C6, C7, C8
	Pronation	Ulnar inclination
	C6, Th1	C7, C8
Hand	Extrinsic muscles	Intrinsic muscles
Hand	C7, C8, Th1	C8