Paul D H, Mulloney B
J Neurophysiol. 1985 Jul;54(1):28-39. doi: 10.1152/jn.1985.54.1.28.
We describe a type of nonspiking premotor local interneuron (interneuron IA) in the abdominal nervous system of Pacifasticus leniusculus. All of its branches are restricted to one side of the midline. These interneurons are identifiable and occur as bilateral pairs, one neuron on each side of abdominal ganglia 3, 4, and 5. The membrane potential of interneuron IA oscillated in phase with the swimmeret rhythm, a motor pattern generated in each of these ganglia, because the neuron received postsynaptic potentials in phase with the rhythm. Sustained hyperpolarization of an individual interneuron IA initiated generation of the swimmeret rhythm in all the ganglia of a quiescent nervous system. Sustained depolarization stopped the swimmeret rhythm in all the active ganglia of a nervous system that was generating the rhythm. Currents injected into one interneuron reset the rhythm. Comparisons of the shapes of the IA interneurons in different ganglia showed that they are similar to each other and distinct from other local interneurons in these ganglia. Interneuron IA has a large integrative segment and relatively few branches that are largely restricted to the lateral neuropil, to which all other kinds of swimmeret neurons also project. We conclude that this interneuron occurs only once in each hemiganglion in abdominal segments 3, 4, and 5, and that it is identifiable. Furthermore, this interneuron is an essential component of the circuit in each hemiganglion that generates the swimmeret rhythm. The interneuron was dye coupled to a particular identifiable motor neuron and not to any other neurons. The motor neuron was not dye-coupled to any other local interneurons. The ability of this motor neuron to reset the rhythm is attributed to its being electrically coupled to interneuron IA in its ganglion.
我们描述了一种存在于平滑太平洋虾腹部神经系统中的非尖峰运动前区局部中间神经元（中间神经元IA）。其所有分支都局限于中线的一侧。这些中间神经元是可识别的，并且以双侧配对的形式出现，在第3、4和5腹神经节的每一侧各有一个神经元。中间神经元IA的膜电位与游泳足节律同步振荡，游泳足节律是在这些神经节中各自产生的一种运动模式，因为该神经元接收与节律同步的突触后电位。对单个中间神经元IA进行持续的超极化会在静止神经系统的所有神经节中引发游泳足节律的产生。持续去极化会使正在产生该节律的神经系统的所有活跃神经节中的游泳足节律停止。注入一个中间神经元的电流会重置节律。对不同神经节中IA中间神经元形状的比较表明，它们彼此相似，且与这些神经节中的其他局部中间神经元不同。中间神经元IA有一个大的整合段，分支相对较少，且大部分局限于外侧神经纤维网，所有其他类型的游泳足神经元也投射到该区域。我们得出结论，这种中间神经元在第3、4和5腹节的每个半神经节中仅出现一次，并且是可识别的。此外，这种中间神经元是每个半神经节中产生游泳足节律的电路的重要组成部分。该中间神经元通过染料偶联到一个特定的可识别运动神经元，而不与任何其他神经元偶联。该运动神经元不与任何其他局部中间神经元进行染料偶联。这种运动神经元重置节律的能力归因于它在其神经节中与中间神经元IA电偶联。
