【摘要】 <正> 对具有镇痛效应的“足三里穴”点区的有髓传入纤维直径谱的研究表明,此区传入纤维的自然配布中,Ⅰ、Ⅱ类纤维显著多于Ⅲ类纤维,其中Ⅱ类约占1/2强(谢竞强、杨进等,1980)。该研究由于切片染色法的限制,未能观察无髓纤维。本工作的目的在于用形态学方法,在未排除交感神经节后纤维的情况下,对具有不同镇痛效应的“足三里穴”点区的有、无髓纤维的数量比例,进行观察和计数,以期对此穴区的传入纤维组成作进一步的了解。更多还原

【Abstract】 After degeneration of all the somatic efferent nerve fibers going to the acupuncture analgesic point of right Zusanli of cats,preparations were made from the tissue blocks containing the acupuncture point on the same side.The silver nitrate staining method was used for demonstrating nonmyelinated nerve fibers.The number ratio of myelinat-ed fibers to nonmyelinated fibers was counted.The findings obtained were as follows:1.In the animals showing marked analgesic effects,the proportion of the number of myelinated fibers to nonmyelinated fibers in the acupuncture point is 2.7:1.2.In the analgesic ineffective animals the proportion of the number of myelinated fibers to nonmyelinated fibers in the acupuncture point is 0.7:1.3.In the non-meridian point of both the analgesic-effective and ineffective animals,the proportion of the number of myelinated fibers to nonmyelinated fibers is 0.8:1.On the basis of the neurophysiological evidence already known and the findings in this study,we tend to consider that the predominance of myelinated afferent fibers over nonmyelinated afferent fibers may be one of the structural characteristics of point ’"Zusanli".It seems that nonmyelinated afferent fibers are not likely to play a role in acupuncture analgesic action.更多还原