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In the human there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into the corresponding cervical, thoracic, lumbar, sacral and coccygeal regions of the spine.
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.n 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 spinal nerve.