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Neuromuscular

Myotome (muscle weakness)

Nerve RootMuscle weakness
C1 None
C2 Longus colli, SCM, Rectus capitis
C3 Traps, Splenius capitis
C4 Traps, Levator scapulae
C5 Supraspinatus, Infraspinatus, Deltoid, Biceps
C6 Biceps, Supinator, Wrist extensors
C7 Triceps, Wrist flexors (rarely, wrist extensors)
C8 Ulnar deviators, Thumb extensors, Thumb adductors (rarely, triceps)
T1-T2 Disk lesions at upper 2 thoracic levels do not appear to give rise to root weakness.
T3-T12 Articular and dural signs and root pn are common. Root signs (cutaneous analgesia) are rare and have such indefinite area that they have little localizing value. Weakness is not detectable.
L1 None
L2 Psoas, Hip adductors
L3 Psoas, Quads, thigh atrophy
L4 Tibialis anterior, Extensor hallucis
L5 Extensor hallucis, Peroneals, Gluteus medius, Dorsiflexors, Hamstrings and calf atrophy
S1 Calf and hamstrings, wasting of gluteals, peroneals, plantar flexors
S2 Same as S1 except peroneals
S3 None
S4 Bladder, rectum
Created by: glopez111