nerve

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Someone may have a backache, or feel like they've pulled a muscle if the lumbar nerve is affected.
The lower division of the fourth lumbar nerve joins the fifth, and the lumbosacral trunk thus formed becomes part of the sacral plexus, which includes the first four sacral nerves.
As a result, the plaintiff suffered a herniated disc causing a lumbar nerve root injury that required two surgeries and left the plaintiff with some permanent disability.
Lumbar plexus blocks produce anesthesia of most of the lumbar nerve roots and some of the sacral nerve roots.