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Study of electron microscopical structure and taste function of regenerated chorda tympani nerve after severance during middle ear surgery

Research Project

Project/Area Number 15591802
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Otorhinolaryngology
Research InstitutionUniversity of Fukui (2004-2005)
福井医科大学 (2003)

Principal Investigator

SAITO Takehisa  University of Fukui, Faculty of Medical Sciences, Associate Professor, 医学部, 助教授 (10139769)

Co-Investigator(Kenkyū-buntansha) TSUZUKI Hideaki  University of Fukui, University of Fukui Hospital, Lecturer, 医学部附属病院, 講師 (90236927)
NARITA Norihiko  University of Fukui, Faculty of Medical Sciences, Assistant Professor, 医学部, 助手 (80345678)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥2,100,000 (Direct Cost: ¥2,100,000)
Keywordschorda tympani nerve / middle ear surgery / nerve reconstruction / nerve regeneration / electron microscopy / myelinated nerve fiber / electrogustometry / filter paper disk method / 鼓索袖経
Research Abstract

1. Method of nerve repair and incidence of regenerated chorda tympani nerve
After the chorda tympani nerve was severed during middle ear surgery, the proximal and distal stumps were anastomosed without suture on the temporal muscle fascia. Even if a nerve gap defect was created, the proximal and distal cut ends were placed on the temporal muscle fascia almost in the original position without nerve graft. During the second stage surgery of middle ear cholesteatoma, regenerated nerve was detected in submucosal layer of the reconstructed eardrum. Incidence of regenerated chorda tympani nerve was 46% (33/71 cases).
2. Functional result using electrogustometry and filter-paper disk method after severance of the nerve
In 33 cases with regenerated chorda tympani nerve, 61% (20/33 cases) had taste function. In other 87 cases whose chorda tympani nerves were severed during middle ear surgery, 24% (21/87 cases) showed recovery of taste function in eather electrogutometry or filter-paper disk method … More .
3. Morphological study of fungiform papillae (distribution and size)
In cases in which regeneration of the chorda tympani nerve was detected during the second stage of the surgery and taste function recovered, distribution and size of the fungiform papillae were observed using digital microscopy and their morphology was recorded in memory card. Distribution of the fungiform papillae was divided into three groups. (1)There was no difference in distribution of papillae between both sides on the tongue. (2)There is a difference in distribution between both sides. (3)The fungiform papillae was completely degenerated on the severed side of the tongue. In 35 cases whose taste function recovered after severance of the nerve, 31% was included in group 1 and 69% was in group 2. On the other hand, in 87 cases in which taste function did not recover, 61% was included in group 2 and 39% was in group 3.
These results indicate that, after severance of the chorda tympani nerve, the chorda tympani nerve regenerate in the middle ear and these regenerated nerve fibers reach to fungiform papillae and re-obtained taste function. Less

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (7 results)

All 2004 2003 Other

All Journal Article (2 results) Book (3 results) Publications (2 results)

  • [Journal Article] 鼓索神経損傷への対応2003

    • Author(s)
      齋藤 武久
    • Journal Title

      JOHNS 19

      Pages: 317-321

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Measure for injury of chorda tympani nerve2003

    • Author(s)
      Takehisa Saito
    • Journal Title

      JOHNS 19

      Pages: 317-321

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] 味覚障害の臨床とQ&A - 鼓索神経損傷後の味覚回復と神経再生 -2004

    • Author(s)
      齋藤 武久
    • Total Pages
      185
    • Publisher
      金原出版
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] 味覚障害の臨床とQ&A-鼓索神経損傷後の味覚回復と神経再生-2004

    • Author(s)
      斎藤武久
    • Total Pages
      185
    • Publisher
      金原出版
    • Related Report
      2004 Annual Research Report
  • [Book] 耳鼻咽喉科診療プラクティス 122003

    • Author(s)
      齋藤 武久
    • Total Pages
      4
    • Publisher
      文光堂
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] 斎藤武久: "鼓索神経切断後の味覚障害の回復"耳鼻咽喉科診療プラクティス. 12. 180-183 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 斎藤武久: "鼓索神経損傷への対応"JOHNS. 19. 317-321 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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