Spinal cord

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The spinal cord is a major component of the central nervous system, beginning in the brainstem and descending along the spinal or vertebral canal. Composed of 31 segments, the spinal cord is a mixture of neurons and glial cells. It transmits nerve information from the brain to the rest of the body. The three membranes that cover and protect the spinal cord are the arachnoid, dura mater, and pia mater. When the spinal cord is injured, there is great risk of paralysis.