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Nerve Roots/Dermatomes/Myotomes

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Nerve Root
Dermatome/Myotome
show Dermatome: Vertex of skull Myotmome: None  
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show Dermatome: Temple, forehead, occiput Myotome: Longus colli, sternocleidomastoid, rectus capitis  
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C3   show
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C4   show
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show Dermatome: Deltoid area, anterior aspect of entire arm to base of thumb Myotome: Supraspinatus, infraspinatus, deltoid, biceps  
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show Dermatome: Anterior arm, radial side of hand to thumb and index finger Myotome: Biceps, supinator, wrist extensors  
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show Dermatome: Lateral arm and forearm to index, long, and ring finger Myotome: Triceps, wrist flexors (rarely wrist extensors)  
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show Dermatome: Medial arm and forearm to long, ring, and little fingers Myotome: Ulnar deviators, thumb extensors, thumb adductors (rarely triceps)  
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T1   show
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show Dermatome: Medial side of upper arm to medial elbow, pectoral and midscapular areas Myomtome: No root weakness noted  
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show Dermatome: T3-6 upper thorax T5-7 costal margin T8-12 abdomen and lumbar region Myotome: Weakness not detectable  
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show Dermatome: Back, over trochanter and groin Myotome: none  
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L2   show
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show Dermatome: Back, upper buttock, anterior thigh and knee, medial lower leg Myotome: Psoas, quadriceps, thigh atrophy  
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show Dermatome: Medial buttock, lateral thigh, medial leg, dorsum of foot, big toe Myotome: Tibilais anterior, extensor hallucis  
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L5   show
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show Dermatome: Lateral and plantar aspect of foot Myotome: Calf and hamstrings, wasting of gluteals, peroneals, plantar flexors  
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S2   show
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S3   show
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S4   show
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