Dermatomes and myotomes — MCQs
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A 58-year-old diabetic man with multiple thoracic vertebral compression fractures presents with progressive lower extremity dysfunction. He has spastic paraparesis with hyperreflexia, bilateral Babinski signs, and a sensory level at T10. However, he also has areflexic bladder, saddle anesthesia, and absent bulbocavernosus reflex. Upper extremities are completely normal. Synthesize the anatomical explanation for this mixed upper and lower motor neuron presentation.
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Embryological basis of dermatomes
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Cervical dermatomes and myotomes
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Thoracic dermatomes and myotomes
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Lumbar dermatomes and myotomes
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Sacral dermatomes and myotomes
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Sensory testing of dermatomes
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Motor testing of myotomes
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Dermatome overlap and clinical implications
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Segmental innervation patterns
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Radiculopathy patterns by level
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