The spinal cord is enlarged in the cervical and lumbar regions,
where the spinal nerves serving the limbs arise.
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Lumbar enlargement.
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Lumbar Enlargement
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C 5-8 and 1st thoracic region of your spinal cord pass impulses
or messages to your neck, arm and hand muscles. This forms a
cervical budge in the cord. Another is found in the lumbar region
for the legs.