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KMID : 0378019840270020116
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New Medical Journal
1984 Volume.27 No. 2 p.116 ~ p.120
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Diameters of Sensory Axons in Lumbosacral Roots and Nerves in the Rat
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Abstract
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There has been debate as to whether there is a size difference between central and peripheral processes of dorsal root genglion cells. In the present study, it is shown that the myelinated central processes of dorsal root genglion cells have mean areas 50% less than the mean areas of the myelinated sensory axons in the same peripheral nerves. Thus the mean diameters of the central myelinated axons are 30% less than the peripheral myelinated axons. The mean areas of the unmyelinted sensory axons in the dorsal roots are 25% of the mean areas of the unmyelinated sensory axons in the same peripheral nerves. Thus the mean diameters of the central unmyelinated axons are 50% of the mean diameter of the unmyelinated sensory axons in the same peripheral nerves. These data indicate that both myelinated and unmyelinated central processes of dorsal root ganglion cells are smaller than the peripheral processes of these same cells for lumbosacral segments in the rat.
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