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Ventral horns- The ventral horn of the spinal cord is one of the grey longitudinal columns found within the spinal cord. It contains the cell bodies of the lower motor neurons which have axons leaving via the ventral spinal roots on their way to innervate muscle fibers
Central canal- The central canal, also known as ependymal canal, is the cerebrospinal fluid-filled space that runs through the spinal cord. The central canal below at the ventricular system of the brain, from which it receives cerebraospinal fluid, and shares the same ependymal lining.
White matter-White matter is tissue in the brain composed of nerve fibers. The fibers (called axons) connect nerve cells and are covered by myelin (a type of fat).
Dorsal root ganglia- A dorsal root ganglion (or spinal ganglion; also known as a posterior root ganglion) is a cluster of neurons (a ganglion) in a dorsal root of a spinal nerve. The cell bodies of sensory neurons known as first-order neurons are located in the dorsal root ganglia.