Boyan G
Zoologisches Institut, Universität Basel, Switzerland.
J Comp Neurol. 1992 Jul 22;321(4):544-54. doi: 10.1002/cne.903210404.
The aim of the present study was to examine the pattern of synaptic interactions among a set of identified homologous interneurons in the segmental nervous system of the locust. This paper presents two main findings: first, serially homologous interneurons that are the progeny of neuroblast 7-4 in the mesothoracic, metathoracic, and first abdominal neuromeres of the locust central nervous system all receive synaptic drive from one and the same presynaptic interneuron. This interneuron has its entire arborization located in these three neuromeres of the central nervous system. It synapses with cells that are siblings, bilateral homologs, and serial homologs, and is itself connected monosynaptically with auditory afferents. The neuronal network that results comprises postsynaptic cells with the same developmental lineage. The second finding is that there is an additional set of synaptic connections among the homologous neurons themselves. All these connections are excitatory, and the pattern of information flow within the network is highly directional. This may relate to the morphologies of the neurons involved and will influence the contribution of homologs from different segments to behavior.
本研究的目的是研究蝗虫节段神经系统中一组已鉴定的同源中间神经元之间的突触相互作用模式。本文呈现了两个主要发现：第一，蝗虫中枢神经系统中胸、后胸和第一腹节神经节中神经母细胞7-4的后代——系列同源中间神经元，均接受来自同一个突触前中间神经元的突触驱动。该中间神经元的整个树突都位于中枢神经系统的这三个神经节中。它与同胞细胞、双侧同源细胞和系列同源细胞形成突触，并且自身与听觉传入神经元单突触相连。由此产生的神经元网络由具有相同发育谱系的突触后细胞组成。第二个发现是同源神经元之间还存在另一组突触连接。所有这些连接都是兴奋性的，并且网络内的信息流模式具有高度方向性。这可能与所涉及神经元的形态有关，并将影响来自不同节段的同源神经元对行为的贡献。
