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KMID : 0378019840270030142
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New Medical Journal
1984 Volume.27 No. 3 p.142 ~ p.146
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Tapering in Myelinated and Unmyelinated Axons in Rat Sacral Roots
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Abstract
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The tapering in dorsal root axons is a possible reason for the marked difference in size in central and compared to peripheral sensory axons in lumbosacral root in the rat. To test this possibility, the myelinated and unmyelinated axons from S1 and S2 dorsal roots were measured in three places; close to the ganglion, midway between ganglion and cord, and close to the spinal cord. The mean diameter of myelinated axons is 4.27μ near ganglion, 4.20μ in the middle of root, and 4.00μ near cord. Thus the change in mean diameters of myelinated axons as one passes from ganglion to cord is about 7%. The mean diameter of unmyelinated axons is not different in three place of the root. Therefore, the tapering does not seem to be a causal factor in explanation of the size difference between the central and peripheral sensory axons.
In the course of this study, it is noted that the mean diameters and the patterns of histograms of myelinated axons are different in dorsal roots of different segments in the rat. Since there is little mention of this in literature, documentation of these differences is provided.
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