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Dermatomes, Myotomes, Reflexes, and Paresthetic Areas

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Nerve Root
Dermatome
Myotome
Reflexes Affected
Paresthesias
C1   Vertex of skull   None   None   None  
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C2   Temple, forehead, occiput   Longus colli, sternocleidomastoid, rectus capitis   None   None  
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C3   Entire neck, posterior cheek, temporal area, prolongation foreward under mandible   Trapezius, splenius capitis   None   Cheek, side of neck  
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C4   Shoulder area, clavicular area, upper scapular area   Trapezius, levator scapulae   None   Horizontal band along clavicle and upper scapula  
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C5   Deltoid area, anterior aspect of entire arm to base of thumb   Supraspinatus, infraspinatus, deltoid, biceps   Biceps, brachioradialis   None  
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C6   Anterior arm, radial side of hand to thumb and index finger   Biceps, supinator, wrist extensors   Biceps, brachioradialis   Thumb and index finger  
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C7   Lateral arm and forearm to index, long, and ring fingers   Triceps, wrist flexors (rarely, wrist extensors)   Triceps   Index, long, and ring fingers  
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C8   Medial arm and forearm to long, ring, and little fingers   Ulnar deviators, thumb extensors, thumb adductors (rarely, triceps)   Triceps   little finger alone or with two adjacent fingers; not ring or long fingers, alone or together (C7)  
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T1   Medial side of forearm to base of little finger   elbow flexion with arm horizontal, scapulae forward and backward on chest wall, neck flexion   None   None  
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T2   Medial side of upper arm to medial elbow, pectoral and midscapular areas   Scapulae moving foreward and backward on chest wall, neck flexion   None   None  
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T3-T12   T3-T6, upper thorax; T5-T7, costal margin; T8-T12, abdomen and lumbar region   None   None   None  
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L1   Back, over trochanter and groin   None   None   Groin; after holding posture which causes pain  
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L2   Back, front of thigh to knee   Psoas, hip adductors   None   Occasionally anterior thigh  
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L3   Back, upper buttock, anterior thigh and knee, medial lower leg   Psoas, quadriceps, thigh atrophy   Knee jerk sluggish, prone knee bend positive, pain on full SLR   Medial knee, anterior lower leg  
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L4   Medial buttock, lateral thigh, medial leg, dorsum of foot, big toe   Tibialis anterior, extensor hallucis   SLR limited, neck flexion pain, weak or absent knee jerk, side flexion limited   Medial aspect of calf and ankle  
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L5   Buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, first, second, and third toes   Extensor hallucis, peroneals, gluteus medius, dorsiflexors, hamstring and calf atrophy   SLR limited one side, neck flexion painful, ankle decreased, crossed-leg raising pain   Lateral aspect of leg, medial three toes  
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S1   Buttock, thigh, and leg posterior   Calf and hamstring, wasting of gluteals, peroneals, plantar flexors   SLR limited, Achilles reflex weak or absent   Lateral two toes, lateral foot, lateral leg to knee, plantar aspect of foot  
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S2   Buttock, thigh, and leg posterior   Calf and hamstring, wasting of gluteals, plantar flexors   SLR limited, Achilles reflex weak or absent   Lateral leg, knee, and heel  
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S3   Groin, medial thigh to knee   None   None   None  
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S4   Perineum, ganitals, lower sacrum   Bladder, rectum   None   Saddle area, genitals, anus impotence, massive posterior herniation  
🗑


   

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