家兔阴茎皮肤感觉脊神经来源的电生理研究

Electrophysiology Research on the Spinal Nerve Source of Rabbit Penis Cutaneous Sensation

目的：探讨家兔阴茎感觉神经来源。方法：健康成年雄性新西兰白兔12只，随机均分为两组：每组6只，A组在左侧脊神经上记录，B组在右侧脊神经上记录。对家兔阴茎施加不同大小的机械刺激，用神经单纤维记录技术，在同侧S1～S4脊神经上记录单纤维放电。结果：通过对家兔阴茎施加各种不同机械刺激，在同侧S2～S3脊神经上能记录到放电，S1、S4脊神经上未能记录到放电。左侧脊神经放电纤维数量分别为：S2：39．67±3．14，S3：21．00±2．19；右侧脊神经放电纤维数量分别为：S2：40．00±3．16，S3：19．67±2．58，左右侧差异无显著性（P〉0．05）。结论：家兔阴茎皮肤感觉来源于S2～S3脊神经。

Objective ： To explicate the spinal nerve source of the rabbit penis cutaneous sensation. Methods ： Twelve adult male rabbits were randomly divided into two groups of equal number. While mechanical stimuli were given to the penis by different yon Frey hairs, single fiber activities were recorded in vivo in the left （Group A） and right （Group B） S1 - S4 spinal nerves, respectively. The mechanical threshold, adaptability and conduction velocity of the fibers were analyzed. Results ： When the ipsilateral penis was mechanically stimulated, discharges were detected in S2 and S3 spinal nerve fibers, but not in S1 and S4. The discharge fibers were 39.67 ±3.14 （S2） and 21.00 ± 2.19 （S3） in the left spinal nerve and 40.00 ± 3.16 （S2） and 19.67 ± 2.58 （ S3 ） in the right. There was no obvious difference between the numbers of the left spinal nerves and the right ones （ P 〉 0. 05）. Conclusion ： The rabbit penis cutaneous sensation originates from S2 and S3 spinal nerves.