Vera P L, Nadelhaft I
VA Medical Center, Pittsburgh, PA 15240.
Brain Res. 1990 Sep 3;526(2):342-6. doi: 10.1016/0006-8993(90)91244-b.
The conduction velocity and segmental distribution of afferent fibers in the rectal nerves of the female rat were determined. These afferent fibers had conduction velocities ranging from 0.5-23.5 m/s (Mode = 0.5 m/s; Median = 1 m/s). Sixty-six percent of the fibers had conduction velocities less than 2.5 m/s and were thus considered to be unmyelinated. Of a total of 135 afferent fibers studied, only 5 (4%) were found in the L6 dorsal root, whereas 130 (96%) were found in the S1 dorsal root. Neuroanatomic tracing studies (Fluoro-Gold applied to the transected rectal nerves) labelled an overwhelming majority of neurons in the S1 dorsal root ganglion, confirming the results of the conduction velocity experiments. Although the conduction velocity distribution of afferent fibers in the rectal nerves is similar to that of the afferent fibers innervating the bladder, the segmental distribution is quite different since most of the bladder afferent fibers (84%) were found in the L6 dorsal root.
测定了雌性大鼠直肠神经中传入纤维的传导速度和节段分布。这些传入纤维的传导速度范围为0.5 - 23.5米/秒（众数 = 0.5米/秒；中位数 = 1米/秒）。66%的纤维传导速度小于2.5米/秒，因此被认为是无髓鞘的。在总共研究的135条传入纤维中，仅在L6背根中发现5条（4%），而在S1背根中发现130条（96%）。神经解剖追踪研究（将荧光金应用于横断的直肠神经）标记了S1背根神经节中的绝大多数神经元，证实了传导速度实验的结果。尽管直肠神经中传入纤维的传导速度分布与支配膀胱的传入纤维相似，但节段分布却大不相同，因为大多数膀胱传入纤维（84%）在L6背根中被发现。
