The Projections of Trigeminal Nerve Fibers to the Medullary Taste Center in Some Teleosts

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In order to reveal whether trigeminal fibers project directly onto the medullary taste center of fish, the fluorescent carbocyanine dye DiI was applied to the stump of the trigeminal nerve root in isolated, fixed brains of 6 species of fish (Halichoerus poecilopterus, Pagrus major, Stephanolepis cirrhifer, Platycephalus indicus, Cyprinus carpio and Carassius auratus). After a diffusion period, the brains were serially sectioned on a vibratome and examined on an Olympus epifluorescence microscope, In each species the entire trigeminal root was clearly labeled and the whole central projections of the trigeminal root were easily traced. The afferent fibers of the trigeminal nerve turn caudally after their entrance to the brain to form the descending root. Through the descending root trigeminal fibers were found to project onto the medullary taste center as well as other trigeminal targets in the medulla and spinal cord in all species of fish examined. The area of the medullary taste center, which receives the trigeminal projections, was found to be a ventromedial portion of the intermediate facial lobe (FL) in Cyprinus carpio and Carassius auratus, and an anterior portion of the longitudinal taste center in the other species examined. This anterior portion corresponds to the FL of the cyprinids. These results suggest that direct projection of trigeminal fibers onto the FL is a general feature in teleosts although the amount of projection varies considerably among species.

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  • Fisheries science : FS  

    Fisheries science : FS 64(2), 276-281, 1998 

    公益社団法人 日本水産学会

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各種コード

  • NII論文ID(NAID)
    10004873959
  • NII書誌ID(NCID)
    AA10993718
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09199268
  • NDL 記事登録ID
    4462731
  • NDL 雑誌分類
    ZR26(科学技術--農林水産--水産)
  • NDL 請求記号
    Z54-H592
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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