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Neuroanatomical studies on the information processing system in the primary facial taste center of fish

Research Project

Project/Area Number 08456099
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field General fisheries
Research InstitutionKagoshima University

Principal Investigator

KIYOHARA Sadao  Kagoshima University, Department of Sciences, Professor, 理学部, 教授 (50117496)

Co-Investigator(Kenkyū-buntansha) KITOH Junzoh  Nagoya University School of Medicine, Professor, 医学部, 教授 (60022802)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1996: ¥4,100,000 (Direct Cost: ¥4,100,000)
KeywordsTASTE / TASTE CENTER / FACIAL LOBE / FACIAL NERVE / TRIGEMINAL NERVE / TASTE BUD / BARBELS / FISH / 味覚神経
Research Abstract

This sutdy was undertaken to reveal neuronatomically the information processing system in the primary facial taste center, facial lobe (FL) of fish. The followings were mainly examined in this study ; 1)the projections of trigeminal fibers to the FL,2)cytoarchitecture of the FL,3)determination of the efferent fibers in the FL,4)projections of the efferent neurons in the FL to the brain stem, and 5)distribution of taste buds and nerve fibers in the barbels in catfish.
The projection of trigeminal fibers onto the FL were found in 6 species of fish. This projection was especially noticeable in the catfishes ; the trigeminal fibers project somatotopically to the FL and distribute in the entire region of the FL except the trunk-tail lobule, indicating that trigeminal fibers contribute to make sharply defined somatosensory map in the FL of the catfish as well as the mechanosensory fibers of the facial nerve. Small (7-9 mum) and large sized (15-20 * 12-15 mum) neurons are present in the barbel … More lobules of Plotosus. Small neurons form cell clusters in the lobules and large neurons are scattered in the lobule. Golgi analyzes revealed that the small neurons are possessed of 50-60 mum dendritic fields around them, while the larger ones have thick dendrites of 150 mum in length. Large sized neurons and their dendrites were entirely surrounded by synaptic terminals of other fibers. Efferent neurons projecting to the superior (SSTN) or inferior (ISTN) secondary taste nuclei were determined as large types of neurons. Ascending neurons were numerous and scattered throughout the lobules, while descending neurons were small in number and located only in the peripheral margin of the lobules. Ascending neurons in each lobule projects to the entire regions of the SSTN located under the cerebellum. This shows that somatotopic organization is not present in the SSTN and support the previous electrophysiological findings that each neuron located in the SSTN has a wide receptive field in response to mechanical or taste stimulation of body surface.
The taste buds were not uniformaly distributed in the barbels. They were most densely located in the rostral or caudal surface along the long axis of the barbels and few in the intermediate surface between the rostral and caudal surfaces. The nerve fibers make neutral networks under the epithelium and each network becomes smaller in the rostral or caudal surface than in the intermediate surface. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 清原 貞夫: "ナマズの三叉神経線維の顔面葉への投射と分布" 日本味と匂学会誌. 3. 534-537 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Kiyohara et al.: "Anatomical studies of the medullary facial lobe in the sea cat fish,plutosus lineatus." Fisheries Science. 62. 511-519 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 清原 貞夫・吉冨 拓児: "ゴンズイ顔面葉の細胞構築と第二次味覚中枢への投射" 日本味と匂学会誌. 4. 385-388 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Kiyohara et al.: "The projections of trigeminal nerve fibers to the medullary taste center in some teleosts" Fisheries Science. 64(in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kiyohara, S: "Projection and distribution of the trigeminal nerve fivers onto the facial lobe of catfish (in Japanese)" The Japanese Journal of Taste and Smell Research. 3(3). 534-537 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kiyohara, S., Kitoh, J., Shito, A.and Yamashita, S.: "Anatomical studies of the medullary facial lobe in the sea catfish Plotosus lineatus" Fisheries Science. 62(4). 511-519 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kiyohara, S., and Yoshitomi, T.: "Cytoarchtecture in the facial lbe and projections from the facial lobe to the superior secondary nuclei in the sea catfsih Plotosus lineatus (in Japanese)" The Japanese journal of Taste and Smell Research. 4(3). 385-388 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kiyohara, S., Shintomo, K.and Yamashita, S.: "The projections of trigeminal nerve fibers to the medullary taste center in some teleosts" Fisheries Science. 64(2). 284-289 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kiyohara,S.Shintomo,K.and Yamashita,S.: "The projections of trigeminal nerve fibers to the medullary taste center in some teleosts" Fisheries Science. 64・2(in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 清原貞夫、 吉富拓児: "ゴンズイ顔面葉の細胞構築と第二次味覚中枢への投射" 日本味と匂学会誌. 4. 385-388 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kiyohara, S.Kitoh, J.Shito, A.and Yamasita,S.: "Anatomical studies of the medullary facial lobe in the sea catfish." Fisheries Science. 62. 511-519 (1966)

    • Related Report
      1997 Annual Research Report
  • [Publications] 清原貞夫: "マナズの三叉神経線維の顔面葉への投射と分布" 日本味と匂学会誌. 3. 534-537 (1966)

    • Related Report
      1997 Annual Research Report
  • [Publications] 清原貞夫: "ナマズの三叉神経線維の顔面葉への投射と分布" 日本味と日学会誌. 3・2. 5325-5328 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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