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UE muscles
Upper extremity function, muscle, cord, and nerves
| Action to be tested | Muscles | Cord segment | Nerve |
|---|---|---|---|
| Neck flexion | Sternocleidomastoideus | C1-C4 | cervical spinal accessory |
| neck extension, neck rotation, neck lateral bending | trapezius, deep neck muscles | C1-C4 | cervical spinal accessory |
| SH shrug, scapula upward rot. | upper trapezius | C1-C4 | spinal accessory |
| SH. horizontal adduction | pectoralis major and minor | C5-C8, T1 | medial/lateral pectoral |
| scapular downward rotation | pectoralis minor | C8-T1 | medial pectoral |
| SH protraction, scapular upward rotation | serratus anterior | C5-C7 | long thoracic |
| scapular elevation, downward rotation | levator scapula (together with lower trapezius) | C5 | dorsal scapular |
| scapular elevation, adduction and downward rotation | rhomboids | C4-C5 | dorsal scapular |
| SH abduction | supraspinatus | C4-C6 | suprascapular |
| SH lat. rotation | infraspinatus | C4-C6 | suprascapular |
| SH medial rotation, adduction | latissimus dorsi,teres major, subscapularis | C5-C8 | subscapular, thoracodorsal |
| SH abduction, flexion, extension | deltoid | C5-C6 | axillary |
| SH lateral rotation | teres minor | C4-C5 | axillary |
| elbow flexion, forearm supination | biceps brachii | C5-C6 | musculucutaneous |
| SH flexion, adduction | coracobrachialis | C6-C7 | musculucutaneous |
| elbow flexion | brachialis | C5-C6 | musculucutaneous |
| 4th&5th DIP flexion | flexor digitorum profundus (ulnar part) | C5-T1 | ulnar |
| wrist ulnar flexion | flexor carpi ulnaris | C7-T1 | ulnar |
| thumb adduction | adductor pollicis | C8-T1 | ulnar |
| 5th digit abduction | abductor digiti quinti | C8-T1 | ulnar |
| 5th digit opposition | opponens digiti quinti | C7-T1 | ulnar |
| 5th digit MCP flexion | flexor digiti quinti brevis | C7-T1 | ulnar |
| 2nd to 5th digit MCP flexion, adduction, abduction | interossei | C8-T1 | ulnar |
| forearm pronation | pronator teres, pronator quadratus | C6-C7 | median |
| wrist radial flexion | flexor carpi radialis | C6-C7 | median |
| wrist flexion | palmaris longus | C7-T1 | median |
| 2nd to 5th digit PIP flexion | flexor digitorum sublimis | C7-T1 | median |
| thumb IP flexion | flexor pollicis longus | C7-T1 | median |
| 2nd-3rd digit DIP flexion | flexor digitorum profundus(radial part) | C7-T1 | median |
| thumb abduction | abductor pollicis brevis | C6-T1 | median |
| thumb MCP flexion | flexor pollicis brevis | C6-T1 | median |
| thumb opposition | opponens pollicis | C8-T1 | median |
| 2nd-5th digit MCP flexion, IP extension | lumbricals | C8-T1 | median |
| elbow flexion (and pronation) | brachioradialis | C5-C6 | radial |
| elbow extension | triceps brachii, anconeus | C6-C8 | radial |
| wrist radial extension | extensor carpi radialis | C6-C8 | radial |
| 2nd-5th digit MCP, IP extension | extensor digitorum communis, extensor digiti quinti proprius | C6-C8 | radial |
| wrist ulnar extension | extensor carpi ulnaris | C6-C8 | radial |
| forearm supination | supinator | C5-C6 | radial |
| thumb MCP abduction | abductor pollicis longus | C7-C8 | radial |
| thumb extension | extensor pollicis longus/brevis | C6-C8 | radial |
| 2nd digit extension | extensor indicis proprius | C6-C8 | radial |