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Sensory information is carried by sensory neurons in dorsal roots, which enter the cord in small bundles called dorsal rootlets. Motor neurons leave the cord in collections of nerves called ventral rootlets, which then coalesce to form a ventral root. ![]() The spinal cord also receives all of the sensory information from the periphery of our bodies, and contains pathways by which that sensory information is passed along to the brain. The spinal cord contains motor neurons that innervate skeletal muscle and allow for movement as well as motor tracts that carry directives for motor movement down from the brain. The spinal cord is one of the two major components of the central nervous system (the other being the brain) its proper functioning is absolutely essential to a healthy nervous system. What is the spinal cord and what does it do? ![]() It is only about 16.5-17.5 inches long on average, with a diameter of less than 1/2 an inch at its widest point. The spinal cord is shorter than the vertebral column, and overall is a surprisingly small structure. The spinal cord runs from the medulla oblongata of the brainstem down to the first or second lumbar vertebrae of the vertebral column (aka the spine). Close-up of spinal cord and dorsal and ventral roots.
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