Root | Pain | Numbness | Weakness | Reflex affected |
C5 | Neck, shoulder, scapula | Lateral arm (in distribution of axillary nerve) | Shoulder abduction, external rotation, elbow flexion, forearm supination | Biceps, brachioradialis |
C6 | Neck, shoulder, scapula, lateral arm, lateral forearm, lateral hand | Lateral forearm, thumb and index finger | Shoulder abduction, external rotation, elbow flexion, forearm supination and pronation | Biceps, brachioradialis |
C7 | Neck, shoulder, middle finger, hand | Index and middle finger, palm | Elbow and wrist extension (radial), forearm pronation, wrist flexion | Triceps |
C8 | Neck, shoulder, medial forearm, fourth and fifth digits, medial hand | Medial forearm, medial hand, fourth and fifth digits | Finger extension, wrist extension (ulnar), distal finger flexion, extension, abduction and adduction, distal thumb flexion | None |
T1 | Neck, medial arm and forearm | Anterior arm and medial forearm | Thumb abduction, distal thumb flexion, finger abduction and adduction | None |
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