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Visual and olfactory input segregation in the mushroom body calyces in a basal neopteran, the American cockroach

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Title: Visual and olfactory input segregation in the mushroom body calyces in a basal neopteran, the American cockroach
Authors: Nishino, Hiroshi Browse this author →KAKEN DB
Iwasaki, Masazumi Browse this author
Yasuyama, Kouji Browse this author
Hongo, Hidenori Browse this author
Watanabe, Hidehiro Browse this author
Mizunami, Makoto Browse this author
Keywords: Mushroom body
Optic lobe
Issue Date: Jan-2012
Publisher: Elsevier
Journal Title: Arthropod Structure & Development
Volume: 41
Issue: 1
Start Page: 3
End Page: 16
Publisher DOI: 10.1016/j.asd.2011.08.005
PMID: 22001372
Abstract: 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.
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 西野 浩史

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