LUMBAR MOTONEURONS OF MAN .1. NUMBER AND DIAMETER HISTOGRAM OF ALPHA AND GAMMA AXONS OF VENTRAL ROOT
LUMBAR MOTONEURONS OF MAN .1. NUMBER AND DIAMETER HISTOGRAM OF ALPHA AND GAMMA AXONS OF VENTRAL ROOT
复制标题
DOI：
10.1097/00005072-197709000-00009
复制
发表时间：
1977-01-01
影响因子：
3.2
通讯作者：
DYCK, PJ
中科院分区：
文献类型：
--
作者：
KAWAMURA, Y;OKAZAKI, H;DYCK, PJ
本文采用改良的组织学处理和形态计量学方法、半自动测量法和程序计算绘图法，对17例17岁~ 81岁男性腰（L3、L4和L5）脊神经根腹侧（vsr）中的大直径和中直径有髓纤维进行了测量。在胸（T11）vsr中发现的一群小直径有髓纤维（推测为节前交感神经纤维）基本上不存在于L3、L4和L5根中。L3脊神经前根平均有5716根（70%）大直径纤维和2625根（30%）中直径纤维。L4 vsr的可比数字为4900（70%）和2152（30%），L5 vsr的可比数字为5043（75%）和1559（25%）。假设这些腰神经根包含很少的（如果有的话）小直径有髓鞘的节前交感神经轴突，则大直径纤维对应于α。运动神经元轴突和小直径纤维到γ。运动神经元轴突随着年龄的增长，估计有髓纤维的数量减少为350根纤维/十年（约100%）。5%/十年）。
The numbers of large and intermediate diameter myelinated fibers of 17 ventral lumbar (L3, L4 and L5) spinal roots (vsr) of man (ages 17-81 yr) were evaluated using the improved methods of histologic processing and morphometry now available, semi-automatic methods of measurement and programmed calculation and plotting. A population of small diameter myelinated fibers as found in thoracic (T11) vsr, which were presumed to be pre-ganglionic sympathetic fibers, were essentially absent from L3, L4 and L5 roots. On the average, there were 5716 (70%) large diameter fibers and 2625 (30%) intermediate diameter fibers in the L3 ventral spinal root. Comparable figures for L4 vsr were 4900 (70%) and 2152 (30%) and for L5 vsr were 5043 (75%) and 1559 (25%). On the assumption that these lumbar roots contain few if any small diameter myelinated pre-ganglionic sympathetic axons, the large diameter fibers correspond to .alpha. motoneuron axons and the small diameter fibers to .gamma. motoneuron axons. With age, a decrease in the number of myelinated fibers was estimated to be 350 fibers/decade (.apprx. 5%/decade).