Upper Extremity Nerve Root

Question 1

Nerve Root C5

Answer 1

Disc Level: C4
Muscle Test: Deltoid (Axillary Nerve) & Biceps (Musculocutaneous Nerve)
Reflex: Biceps
Sensation: Lateral arm

Question 2

Nerve Root C6

Answer 2

Disc Level: C5
Muscle Test: Wrist extension carpi radialis longus & brevis, and extensor carpi ulnaris (radial nerve)
Reflex: Brachioradialis
Sensation: Anterior lateral forearm, palm, thumb, and 2nd digit

Question 3

Nerve Root C7

Answer 3

Disc Level: C6
Muscle Test: Elbow Extension-triceps (radial nerve) Wrist Flexion- Flexor carpi radialis (median nerve), flexor carpi ulnaris (ulnar nerve) Finger Extension- Extensor digitorum communis, extensor indicis profundus, extensor digiti minimi (radial nerve)
Reflex: Triceps
Sensation: 3rd digit, middle of palm

Question 4

Nerve root C8

Answer 4

Disc Level: C7
Muscle Test: Finger Flexion- flexor digitorum superficialis, flexor digitorum profundus, lumbricals (median and ulnar nerves)
Reflex: None
Sensation: 4th and 5th digits, antero-medial hand and forearm

Question 5

Nerve Root T1

Answer 5

Disc Level: T1
Muscle test: Finger abduction- dorsal interossei (ulnar nerve) Finger adduction- palmer interossei (ulnar nerve)
Reflex: None
Sensation: Antero-medial arm (distal aspect of arm to proximal aspect of forearm)