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The spinal cord is a long, cable-like structure made up of hundreds of nerve fibers, which is approximately 17 inches (42 cm) long. The brain and the spinal cord compose the central nervous system.
Spinal cord and cauda equina. Note that the spinal cord ends at about L1, with the conus medullaris. Nerve roots travel further down as the cauda equina. Their relative mobility within the cerebrospinal fluid decreases the risk of neural damage with subarachnoid injections done at the L4 level.