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1996 Fiscal Year Final Research Report Summary

Functional anatomy of nonspiking interneuron dendrites

Research Project

Project/Area Number 07640894
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 動物生理・代謝
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

TAKAHATA Masakazu  Hokkaido Univ., Grad.Sch.Sci., Prof., 大学院・理学研究科, 教授 (10111147)

Project Period (FY) 1995 – 1996
KeywordsCrayfish / Sensory nonspiking interneuron / Premotor nonspiking interneuron / Dendrites / Confocal laser scanning microscope / Synaptic integration / Electrotonic structure / Passive membrane properties
Research Abstract

The structure of sensory and premotor nonspiking interneurons in the terminal abdominal ganglion of the crayfich, Procambarus clarkii Girard, has been studied quantitatively by 3-dimensional morphometry, using a confocal laser scanning microscopic system. Their passive membrane properties have also been studied electrophysiologically to analyze their electrotonic structure. Two types of premotor nonspiking interneurons, AL- and PL-types that are characterized by different structure of major dendrites and different location of cell bodies in the ganglion, have been found to share common dendritic field in the neuropil. They are different from each other both morphologically and physiologically : the PL-type cells show a larger number of branching, anatomically longer fine (<3 mm) dendrites and shorter time and length constants (p<0.05). The total electrotonic length of fine dendrites is accordingly significantly longer in PL- than in AL-type cells. The total anatomical and electrotonic lengths of whole dendrites were not statistically different between them (P>0.05). An identified sensory interneuron had significantly shorter membrane time constant and length constant. Comparison of morphological and electrophysiological properties between premotor and sensory nonspiking interneurons has revealed that the total anatomical length of thick dendrites (>3 mm) is greater in the sensory than in premotor cells whereas the time and length constants are smaller in the former (P<0.05). The total electrotonic lengths of both thick and fine dendrites of the sensory interneuron were significantly greater than those of premotor cells (P<0.05). The difference in electrotonic structure between sensory and premotor nonspiking interneurons seems to reflect their different manners of synaptic integration in the control of postsynaptic nerve cells.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Mikio Takahashi: "Regional characteristics of the membrane response of an identified crayfish nonspikeng interneuron to intracellularly injected current" Journal of Neurophysiology. 74. 2242-2250 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ryou Hikosaka: "Variability and invariability in the structure of an identified nonspiking interneuron of crayfish as revealed by three-dimensional morphometry" Zoological Science. 13. 69-77 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Maki Murayama: "Sensory control mechanisms of the uropod equilibrium reflex during walking in the crayfish Procambarus clarkii" Journal of Expermental Biology. 199. 521-528 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mikio Takahashi et al.: "Regional characteristics of the membrane response of an identified crayfish nonspiking interneuron to intracellularly injected current" Journal of Neurophysiology. 74. 2242-2250 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ryou Hikosaka et al.: "Variability and invariability in the structure of an identified nonspiking interneuron of crayfish as revealed by three-dimensional morphometry" Zoological Science. 13. 69-77 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Maki Murayama: "Sensory control mechanisms of the uropod equilibrium reflex during walking in the crayfish Procambarus clarkii" Journal of Experimental Biology. 199. 521-528 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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