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Sacral spinal nerve

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Definition

noun, plural: sacral spinal nerves

Any of the five pairs of nerves that emerge from the sacral region of the spinal cord, through the sacral vertebrae of the vertebral column


Supplement

The spinal nerve is a nerve that occurs in pairs emerging from the spinal cord. Each pair is attached to the cord by two roots, i.e. the anterior (ventral) and posterior (dorsal) roots. Although these two roots unite in the intervertebral foramen they divide again into anterior division (or ventral ramus) and posterior division (or dorsal ramus).1 In humans, there are 31 pairs of spinal nerves emerging from the spinal cord and are grouped based on the corresponding regions of the vertebral column, i.e. cervical spinal nerves, thoracic spinal nerves, lumbar spinal nerves, sacral spinal nerves, and coccygeal spinal nerves. These nerves emerge from the spinal cord through an opening called intervertebral foramen (an opening between adjacent vertebrae of the vertebral column).

The sacral spinal nerves are spinal nerves emerging from the sacral region of the spinal cord. They all emerge above their corresponding vertebrae. The lumbar spinal nerves are as follows:

  • sacral spinal nerve 1 (S1)
  • sacral spinal nerve 2 (S2)
  • sacral spinal nerve 3 (S3)
  • sacral spinal nerve 4 (S4)
  • sacral spinal nerve 5 (S5)


See also:


Reference(s):
1 spinal nerve. (n.d.). The American Heritage® Science Dictionary. Retrieved from Dictionary.com website http://www.dictionary.com/browse/spinal-nerve