Saturday 29 June 2013

How are the intervertebral discs innervated?



Why do we feel pain in the cervical region in case of a herniated disc? Shouldn't the symptoms be only in the affected dermatome (paresthesia, anesthesia and radiating pain) and/or myotome (muscle weakness or paralysis)? This was the question I has and I read about the meningeal branches of spinal nerve.

After emerging from the intervertebral foramen, each spinal nerve gives off a small meningeal branch which reënters the vertebral canal through the intervertebral foramen and supplies the vertebræ and their ligaments, and the blood vessels of the medulla spinalis and its membranes. The spinal nerve then splits into a posterior or dorsal, and an anterior or ventral division, each receiving fibres from both nerve roots.

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