Muscles: The Spinal Cord Whistle

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The spinal nerves communicate with the spinal cord via anterior and posterior roots. The anterior roots contain motor nerve fibres, carrying nerve impulses away from the central nervous system. The posterior roots contain sensory nerve processes, carrying information towards the central nervous system. An enlargement midway along posterior root, known as a spinal ganglion, contains the cell bodies of these sensory nerves, while the cell bodies of the motor nerves are found in the anterior region of the spinal cord grey matter. These nerve roots divide and branch out medially as they attach to the spinal cord, forming anterior and posterior rootlets. The section of spinal cord that gives rise to each set of posterior and anterior rootlets is

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