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Muscle Weakness

Myotome Muscle Weakness

Nerve Root:Muscle Weakness (myotome):
C1 none
C2 Longus colli, sternocleidomastoid, rectus capitus
C3 Trapezius, splenius capitus
C4 Trapezius, 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 Disk lesions @ upper 2 thoracic levels dont give rise 2 root weakness of hand intrinsic muscles r due 2 other pathology. Dural & nerve root stress has T1 elbow flex w/ arm horizontal. T1-2 scapulae ->&back on chest wall. Neck flex at any thoracic level
T2 Disk lesions @ upper 2 thoracic levels dont give rise 2 root weakness of hand intrinsic muscles r due 2 other pathology. Dural & nerve root stress has T1 elbow flex w/ arm horizontal. T1-2 scapulae ->&back on chest wall. Neck flex at any thoracic level
T3-T12 Articular & dural signs & root pain r common. Root signs (cutaneous analgesia) r rare & have such indefinate are that they have little localizing value. Weakness is not detectable
L1 None
L2 Psoas, hip adductors
L3 Psoas, quadriceps, thigh atrophy
L4 Tibialis anterior, extensor hallucis
L5 Extensor hallucis, peroneals, gluteus medius, DF, hamstring and calf atrophy
S1 Calf and hamstrings, wasting of gluteals, peroneals, PF
S2 Calf and hamstrings, wasting of gluteals, PF
S3 None
S4 Bladder and rectum
Created by: Hunter10
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