Visual and olfactory input segregation in the mushroom body calyces in a basal neopteran, the American cockroach
Visual and olfactory input segregation in the mushroom body calyces in a basal neopteran, the American cockroach
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DOI：
10.1016/j.asd.2011.08.005
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发表时间：
2012-01-01
影响因子：
2
通讯作者：
Mizunami, Makoto
中科院分区：
文献类型：
--
作者：
Nishino, Hiroshi;Iwasaki, Masazumi;Mizunami, Makoto
美洲大蠊是一种进化的基础新翅目昆虫，拥有昆虫中最大、最复杂的蘑菇体之一。通过在原大脑中进行细胞内记录和染色，我们发现了两种新型神经元，除了之前报道的神经元之外，它们还接收来自视叶的直接输入。这些神经元在视叶中具有树突状突起，在视束中具有投射位点，并且几乎专门将轴突末端发送到MB灯盏的最内层（MB的输入位点）。它们对视觉刺激的反应是兴奋的，但对嗅觉刺激的反应是抑制的，对尾叶的机械感觉刺激反应较弱。相反，树突主要位于触角叶投射部位的中间神经元将轴突末端发送到肾盏的中层到外层。它们受到天线的各种嗅觉刺激和机械感觉刺激的刺激。这些结果表明，MB 花萼中存在一般形态特异性的末端分离，这是昆虫进化的早期事件。讨论了这些神经元可能的突触后和突触前元件。 (C) 2011 Elsevier Ltd. 保留所有权利。
The cockroach Periplaneta americana is an evolutionary basal neopteran insect, equipped with one of the largest and most elaborate mushroom bodies among insects. Using intracellular recording and staining in the protocerebrum, we discovered two new types of neurons that receive direct input from the optic lobe in addition to the neuron previously reported. These neurons have dendritic processes in the optic lobe, projection sites in the optic tracts, and send axonal terminals almost exclusively to the innermost layer of the MB calyces (input site of MB). Their responses were excitatory to visual but inhibitory to olfactory stimuli, and weak excitation occurred in response to mechanosensory stimuli to cerci. In contrast, interneurons with dendrites mainly in the antennal lobe projection sites send axon terminals to the middle to outer layers of the calyces. These were excited by various olfactory stimuli and mechanosensory stimuli to the antenna. These results suggest that there is general modality-specific terminal segregation in the MB calyces and that this is an early event in insect evolution. Possible postsynaptic and presynaptic elements of these neurons are discussed. (C) 2011 Elsevier Ltd. All rights reserved.