Nerve root

Nerve root

A nerve root is the initial segment of a nerve leaving the central nervous system. Types include:

  • A cranial nerve root, the beginning of one of the twelve pairs leaving the central nervous system from the brain stem or the highest levels of the spinal cord;
  • A spinal nerve root, the beginning of one of the thirty-one pairs leaving the central nervous system from the spinal cord. Each spinal nerve root consists of the union of a sensory dorsal root and a motor ventral root.




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  • nerve root — Anat. a nerve fiber bundle that emerges from either side of the spinal cord and joins with a complementary bundle to form each spinal nerve in the series of spinal nerves: the root at the rear of the spinal cord (dorsal root or sensory root)… …   Universalium

  • nerve root — Anat. a nerve fiber bundle that emerges from either side of the spinal cord and joins with a complementary bundle to form each spinal nerve in the series of spinal nerves: the root at the rear of the spinal cord (dorsal root or sensory root)… …   Useful english dictionary

  • nerve root — That part of the nerve close to its origin from a ganglion, cord or brain; may be just inside or outside of the ganglion, etc …   Dictionary of invertebrate zoology

  • nerve root motor — radix posterior nervi spinalis …   Medical dictionary

  • nerve root sensory — radix anterior nervi spinalis …   Medical dictionary

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  • root sleeve fibrosis — fibrosis and thickening of the dura mater resulting from prolonged nerve root pressure …   Medical dictionary

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