Abnormalities
Nerve root	Interspace	Pain distribution	Motor	Sensory	Reflex
C4	C3 to C4	Lower neck, trapezius	—	Cape distribution (i.e., lower neck and upper shoulder girdle)	—
C5	C4 to C5	Lateral arm, neck, shoulder	Deltoid, elbow flexion	Lateral arm	Biceps
C6	C5 to C6	Dorsolateral arm, neck, thumb	Biceps, wrist extension	Lateral forearm, thumb	Brachioradialis
C7	C6 to C7	Dorsolateral forearm, middle finger, neck	Triceps, wrist flexion	Dorsal forearm, long finger	Triceps
C8	C7 to T1	Medial forearm, neck, ulnar digits	Finger flexors	Medial forearm, ulnar digits	—
T1	T1 to T2	Ulnar forearm	Finger intrinsics	Ulnar forearm	—