The paired bundles of nerve fibers entering and leaving the spinal cord at each segment. The dorsal and ventral nerve roots join to form the mixed segmental spinal nerves. The dorsal roots are generally afferent, formed by the central projections of the spinal (dorsal root) ganglia sensory cells, and the ventral roots efferent, comprising the axons of spinal motor and autonomic preganglionic neurons. There are, however, some exceptions to this afferent/efferent rule. [ MESH:A08.800.800.720.725 ]
Synonyms: root of spinal nerve spinal root spinal neural root
Term information
- NCIT:C12791
- GAID:717
- FMA:14060
- MESH:D013126
- ZFA:0005578
- DHBA:146035120
- BTO:0000883
- UMLS:C0037940 (ncithesaurus:Spinal_Nerve_Root)
human_reference_atlas
ZFA has part_of to spinal cord but this causes spatial disjointness violations (CNS/PNS)
Term relations
- nerve root and extends_fibers_into some spinal nerve and extends_fibers_into some spinal cord
- nerve root
- contributes to morphology of some spinal nerve
- extends_fibers_into some spinal cord
- contributes to morphology of some spinal cord
- extends_fibers_into some spinal nerve