In anatomy and neurology, the ventral root or anterior root is the efferent motor root of a spinal nerve. At its distal end, the ventral root joins with the dorsal root to form a mixed spinal nerve. Diagrammatic transverse section of the medulla spinalis and its membranes. A portion of the spinal cord, showing its right lateral surface. The dura is opened and arranged to show the nerve roots. Scheme showing structure of a typical posterior root the posterior, or sensory, division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the anterior root to form the nerve before it emerges from the intervertebral foramen; each posterior root bears a spinal ganglion that conveys sensory fibers to the spinal cord. root. 1. the descending and subterranean part of a plant. 2. that portion of an organ, such as a tooth, hair, or nail, that is buried in the tissues, or by which it arises from another structure, or the part of a nerve that is adjacent to the center to which it is connected. The ventral root (motor root) of each spinal nerve consists of axons from motor neurons whose cell bodies are found within the gray matter of the spinal cord. A ventral root and a dorsal root unite to form a spinal nerve, which passes outward from the vertebral canal through an intravertebral foramen (bone opening). A posterior branch (posterior ramus) of each spinal nerve turns toward the posterior to innervate muscles and skin of the back.  From Wikipedia, the free encyclopedia. The dorsal root of spinal nerve (or posterior root of spinal nerve) is one of two roots which emerge from the spinal cord. It emerges directly from the spinal cord, and travels to the dorsal root ganglion. Nerve fibres with the ventral root then combine to form a spinal nerve. The root emerges from the posterior part of the spinal cord and travel to the dorsal root ganglion. This contains the cell bodies of the nerve fibres contained in the root. The lateral division of the dorsal root contains lightly myelinated and unmyelinated fibres of small diameter. Page: 1 2 3 4. ROOTS OF THE SPINAL NERVES Thirty-one pairs of spinal nerves connect the cord with the periphery. Each nerve is joined to the cord by two roots: an anterior, efferent or motor root and aposterior, afferent or sensory root (Figs. 138 and 146). These roots descend more or less from their cord attachment to the inter-vertebral foramen in which they unite to form the spinal nerve. In all spinal nerves, except the first, the anterior root (radix anterior) is smaller than the posterior. It is composed of from four to six fasciculi, which soon combine into two bundles. After piercing the dura mater, the anterior root unites with the posterior, beyond the latter's ganglion, and forms a Medulla spinalis. A spinal nerve with its anterior and posterior. The motor tract. Diagrammatic transverse section of the medulla spinalis and its membranes. A portion of the spinal cord, showing its right lateral surface. The dura is opened and arranged to show the nerve roots. Scheme showing structure of a typical spinal nerve.
https://en.wikipedia.org/wiki/Anterior_root_of_spinal_nerve http://medical-dictionary.thefreedictionary.com/Anterior+root http://www.innerbody.com/image_skel04/nerv93.html https://en.wikipedia.org/wiki/Dorsal_root_of_spinal_nerve http://gluedideas.com/content-collection/anatomy-of-the-brain/Roots-of-the-Spinal_P1.html https://en.wikipedia.org/wiki/Anterior_root_of_spinal_nerve
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