Anatomy of the vertebral canal
The spinal cord has 31 spinal segments and pairs of spinal nerves: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. The spinal cord and the spinal nerve roots are covered by the spinal meninges, which consist of the dura mater, arachnoid mater, and pia mater.