Dermatomes, Myotomes, Reflexes, and Paresthetic Areas
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| 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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