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Structure and synaptic function of local reflex circuit for crayfish uropod motor control system

Research Project

Project/Area Number 06640872
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 動物生理・代謝
Research InstitutionHokkaido University

Principal Investigator

NAGAYAMA Toshiki  Hokkaido University, Graduate School of Science, Associate Professor, 大学院理学研究科, 助教授 (80218031)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsNeuroethology / Seusory / Motor / Interneurones / Crayfish / Nonspiking / Neural network / Morphology / 三次元 / 感覚情報 / 運動出力 / ノンスパイキングニューロン / 形態 / 機能
Research Abstract

The aim of research is to understand the functional role of local circuit neurones and fundamental roganization of neural circuit relating to behavioral context. Mechanical stimulation of the tailfan in crayfish procambarus clarkii elicits a "dart" -like avoidance reaction. The crayfish closed both uropods and walks forward with extension of the abdomen. The movement of the uropod is mediated by local circuit neurones, including nonspiking and spiking local interneurones and ascending interneurones.
Synaptic connection to and from nonspiking local interneurones in the avoidance reaction is investigated in detail by using simultaneous intracellular recordings and stainings. Some nonspiking local interneurones received excitatory exteroceptive sensory inputs directly from hair afferents. Boththe ascending and spiking local interneurones also received direct inputs from the afferents via chemical synapses. Neither direct connection between motor neurones and afferents nor direct inhibitory connection from hair afferents were detected.
Inhibitory inputs from hair afferents were transmitted ento nonspiking interneurones via mediated by spiking local interneurones. Indirect excitatory inputs from hair afferents were also transmitted into nonspiking interneurones by intersegmental ascending interneurones. Some nonspiking interneurones made either excitatory or inhibitory connection with other nonspiking interneurones. Membrane potential change of nonspiking local interneurones was, in turn, effective to change the membrane potential of uropod motor neurones by means of gradual release of chemical transmitters.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Nanba H: "Terminal purojection of descending interneuroues coutrolling uroped movements of the crayfish Procailans clarkii Girand" Zoological Science. 12. 523-534 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Newland PL: "The strueture, vespouse properties and development of a hair plate on the mesothonacie leg of the locust" Journal of Experimental Biology. 198. 2397-2404 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ushizawa T: "Choligergia trasmission of mechanosensory afferents in the crayfish terminal abdominal gauglion" Journal of Comparative Physiology A. 178 (in press). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Namba H,Nagayama T & Takahata M: "Terminal projection of descending interneurones controlling uropod movements of the crayfish Procambarus clarkii Girard" Zool.Sci.12. 523-534 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Newland PL,Watkins B,Emptage NJ & Nagayama T: "The structure, response properties and development of a hair plate on the mesothoracic leg of the locust" J.Exp.Biol.198. 2397-2404 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ushizawa T,Nagayama T & Takahata M: "Cholinergic transmission of mechanosensory afferents in the crayfish terminal abdominal ganglion" J.Comp.Physiol.A. 178(in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Nawba H: "Terwiual projection of descending interneurones controlling uropod wovewents of the crarfigh Precawbanes clarlcii Givard." Zool.Sci. 12. 523-534 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Newland PL: "The strueture response properties and developwent of a hair plate on the wesothovacio leg of the locnst." J.Exp.Biol.198. 2397-2404 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Ushizawa T: "Cholinergic transmission of mechanoseusory afyerents in the crayfish termiual abdominal ganglion." J.Comp.Physiol.A. 178(in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Aonuma H: "Output effects of identified ascending interveurons in the terminal abdominal gauglion of the crayfish Proca-brvus Clarleii (Girard)." Zoological Science. 11. 191-202 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Namba H: "Descending control of novspiking local interneurous in the termina abdominal gauglion of the crayfish" Journal of Neurophysiology. 72. 235-247 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Nagayama T: "Morphological and physiological bases of crayfish local circuit nearones" Histology Histolpathology. 9. 791-805 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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