Zupanc G K, Horschke I
Abteilung Physikalische Biologie, Max-Planck-Institut für Entwicklungsbiologie, Tübingen, Germany.
Brain Res. 1996 Nov 11;739(1-2):201-9. doi: 10.1016/s0006-8993(96)00818-9.
The weakly electric fish Apteronotus leptorhynchus produces electric organ discharges which are highly stable in waveform and frequency. Short-term modulations of these discharges, typically displayed during social interactions, are controlled by the prepacemaker nucleus (PPn). Neurons of this thalamic cell group intermingle with cells of the central posterior nucleus (CP) to form a complex called 'CP/PPn'. By employing in vitro tract-tracing techniques, we have, in the present investigation, demonstrated that this complex receives input from the tectum opticum. The tectal input is mediated by varicose fibers forming an elongated stripe at the ventral rim of the CP/PPn. As suggested by retrograde tracing from the CP/PPn, this projection is likely to arise from 'multipolar cells with an ascending axon' previously characterized in a Golgi study [14]. As this tectal cell type has been shown to be predominantly driven by electrosensory stimuli [6], information arising from these cells may be used in controlling modulations of the electric organ discharges.
弱电鱼线翎电鳗会产生波形和频率高度稳定的电器官放电。这些放电的短期调制通常在社交互动中表现出来，由前起搏器核（PPn）控制。这个丘脑细胞群的神经元与中央后核（CP）的细胞相互交织，形成一个名为“CP/PPn”的复合体。在本研究中，我们通过体外束路追踪技术证明，这个复合体接收来自视顶盖的输入。顶盖输入由曲张纤维介导，这些纤维在CP/PPn腹侧边缘形成一条细长的条纹。正如从CP/PPn逆行追踪所表明的那样，这种投射可能来自高尔基体研究中先前描述的“具有上升轴突的多极细胞”[14]。由于这种顶盖细胞类型已被证明主要由电感觉刺激驱动[6]，来自这些细胞的信息可能用于控制电器官放电的调制。
