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Spinal cord disease results from multiple diverse pathologic processes. Trauma is the most common cause of spinal cord injury. Depending on its pathogenesis, spinal cord disease can manifest with variable impairment of motor, sensory, or autonomic function. This review focuses on spinal cord anatomy. Basic clinical descriptions of common patterns of spinal cord involvement are related to essential aspects of spinal cord anatomy. The spinal cord is located inside the vertebral canal, which is formed by the foramina of 7 cervical, 12 thoracic, 5 lumbar, and 5 sacral vertebrae, which together form the spine. The spinal cord extends from the foramen magnum down to the level of the first and second lumbar vertebrae. The spinal nerves consist of the sensory nerve roots, which enter the spinal cord at each level, and the motor roots, which emerge from the cord at each level. The spinal nerves are named and numbered according to the site of their emergence from the vertebral canal. C1-7 nerves emerge above their respective vertebrae. C8 emerges between the seventh cervical and first thoracic vertebrae. The remaining nerves emerge below their respective vertebrae.