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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.
Histological organization of spinal cord, Relation between spinal and vertebral segments | Science online
The spinal cord carries signals from the brain: It receives signals from the brain that control movement and autonomic functions, It carries information to the brain: The spinal cord nerves also transmit messages to
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.
An overview of the anatomy of the spinal cord, including the differences between grey and white matter, blood supply of the cord and relevant pathology.
