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Unmyelinated sensory and preganglionic fibers in rat L 6 and S 1 ventral spinal roots
Author(s) -
Coggeshall Richard E.,
Maynard Christine W.,
Langford Lauren A.
Publication year - 1980
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.901930103
Subject(s) - anatomy , sensory system , spinal cord , biology , dorsal root ganglion , dorsum , neuroscience
Approximately 30% of the axons in the L 6 and S 1 ventral roots in the rat are unmyelinated. Appropriate surgical procedures show that 30% of these unmyelinated axons arise from dorsal root ganglion cells and are therefore presumably sensory. Thus approximately 10% of the total number of axons in these ventral roots are sensory. The other 70% of the unmyelinated axons come from the spinal cord and are therefore presumably preganglionic parasympathetic fibers. Thus approximately 20% of the axons in these ventral roots are unmyelinated preganglionic fibers. The implications of these findings are discussed.