Brodfuehrer P D, Kogelnik A M, Friesen W O, Cohen A H
Department of Biology, Bryn Mawr College, Pennsylvania 19010.
Behav Neural Biol. 1993 Mar;59(2):162-6. doi: 10.1016/0163-1047(93)90912-2.
In the medicinal leech, Hirudo medicinalis, isolated segmental nerve cords are capable of generating swimming activity. The role played by the head and tail ganglia in regulating the expression of swimming activity by the segmental nerve cord was evaluated by comparing swimming activity in nerve cord preparations with and without the head and tail ganglia attached. Several swim properties were examined, including length of induced swim episodes, ability to initiate swim episodes, swim cycle period, and phase. We found that, in general, the presence of the tail ganglion attached to isolated nerve cords countered the effects produced by the head ganglion on swimming activity. Moreover, we observed that the tail ganglion itself provides excitatory drive to the swim generating system. Thus, the inputs from the head and tail ganglia influence significantly the expression of swimming activity.
在医用水蛭（欧洲医蛭）中，分离的节段神经索能够产生游泳活动。通过比较附有和不附有头节和尾节神经节的神经索制剂中的游泳活动，评估了头节和尾节神经节在调节节段神经索游泳活动表达中所起的作用。检查了几个游泳特性，包括诱导游泳发作的持续时间、引发游泳发作的能力、游泳周期和阶段。我们发现，一般来说，附着在分离神经索上的尾节神经节抵消了头节神经节对游泳活动产生的影响。此外，我们观察到尾节神经节本身为游泳产生系统提供兴奋性驱动。因此，来自头节和尾节神经节的输入显著影响游泳活动的表达。
