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We have 31 pairs of spinal nerves and they are named after the section of the spine they come out of. 8 pairs of cervical nerves (C1-C8) 12 pairs of thoracic nerves (T1 â T12) 5 pairs of lumbar nerves (L1-L5) 5 pairs of sacral nerves (S1-S5)
The roots of the spinal nerves are also shown. (B) Microscopic view of the spinal cord in cross-section (x5). There are 31 pairs of spinal nerves, each pair numbered according to the level of the spinal cord from which it arises (see Fig. 5-11) .Each nerve is attached to the spinal cord by two roots: the dorsal root and the ventral root (see Fig.5-12) . On each dorsal root is a marked swelling of gray matter called the dorsal root ganglion, which contains the cell bodies of the sensory neurons.ach spinal nerve continues only a short distance away from the spinal cord and then branches into small posterior divisions and larger anterior divisions. The larger anterior branches interlace to form networks called plexuses, which then distribute branches to all parts of the body (see Fig.