喉頭筋筋線維構成の比較解剖学的研究:1.ヒトとカニクイザルの比較 COMPARATIVE STUDIES OF MYOFIBROUS ORGANIZATION OF THE LARYNGEAL MUSCLES:1. HUMAN AND CRAB-EATING MONKEY

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Abstract

喉頭の発声機能と喉頭筋との関係を形態学的に解析するために, ヒトおよびサルの喉頭各筋の筋線維構成を検討した.研究材料はヒト成人およびカニクイザル成獣の各4例から得られた喉頭筋で, 喉頭筋の観察はゼラチン包埋, Sudan Black B染色標本により, 筋線維を赤筋線維, 中間筋線維, 白筋線維に分類し, 断面の筋線維数, 筋線維の太さおよび密度を検討した.結果は次の通りである.1.ヒトでは筋腹横断面の筋線維総数は披裂筋と輪状甲状筋が最も多く, 喉頭蓋筋群が最も少なく, 筋線維の太さはその逆の傾向を示し, 密度は後輪状披裂筋, 輪状甲状筋および甲状披裂筋が高く, 喉頭蓋筋は著しく低かった.2.筋線維型は一般に白筋線維が40%前後で最も多く, 以下僅かの差で赤筋線維, 中間筋線維の順であり, 筋線維の太さは3筋線維型とも喉頭蓋筋群が最も大で, 白筋線維と中間筋線維では甲状披裂筋が, 赤筋線維では後輪状披裂筋がそれぞれこれに次いでいた.3.これに対してサルでは喉頭蓋筋を欠き, ヒトに比べて各筋とも筋線維は少なくて披裂筋及び輪状甲状筋で特にその差が著しかった.3筋線維型の頻度は白筋線維が一般に50%前後を占め, ヒトよりも高く, その差は披裂筋及び甲状披裂筋で著しかったが, 白筋線維の太さはヒトに比べて小で, その差は甲状披裂筋, 次いで披裂筋と外側輪状披裂筋の順に著明であった.4.以上の事からサルではヒトに比べて声門の後部を閉鎖する筋, 及び緊張した声帯の複雑な変化に携わる筋の発達が弱いことになり, その結果, サルの喉頭は高調な短い発声には適するが, 連続的な種々の音調の発声には適しないと考えることが出来た.

The myofibrous organization of the laryngeal muscles of the human and the macaques were investigated for the morphological analysis of the correlations between the vocalization and the laryngeal muscles. Materials and methods : The materials were obtained from the 4 adult human and 4 crab-eating macaques. The materials were embedded in gelatine and stained with Sudan Black B. On the transverse section of the muscle belly, the number, the size, the density and the type of the muscle fibers were investigated. Results : 1. On the number of muscle fibers of human laryngeal muscles, that of the arytenoideus muscle and the cricothyroideus muscle were the largest, and those of the epiglotticus muscles were the smal-lest. 2. On the fiber size of the human laryngeal muscles, that of the epiglotticus muscles were the largest and the thyreoarytenoideus muscle showed the secondmost size. Within the rest of laryngeal muscles, the arytenoideus muscle showed the smallest size of the fibers. 3. On the muscle fiber density of human laryngeal muscles, that of the epiglotticus muscles show-ed the remarkable low density. 4. Each laryngeal muscle in human contained about 40% white fibers, about 35% red fibers and about 25% intermediate fibers, respectively. 5. The macaques lacked the epiglotticus muscles. The number of the muscle fibers and the size of muscle fibers of each laryngeal muscle of the macaques were smaller than that of human. Above all, the differences observed in the arytenoideus muscle and the cricothyroideus muscle between the human and the macaques were remarkable. And the percentage of the white muscles fiber in the each laryngeal muscle of macaque were higher than that of human. 6. On compare to human, the muscles which participate the closing of the posterior part in the glottis and the extending, tensing and adducting of the vocal cord are undeveloped relatively in macaque. Consequently, the larynx of macaque is good for the short phonation accompanying the high sound and not good for the continuous and various tone phonation.

Journal

  • Journal of The Showa Medical Association

    Journal of The Showa Medical Association 46(2), 173-181, 1986

    The Showa University Society

Cited by:  2

Codes

  • NII Article ID (NAID)
    130001826997
  • NII NACSIS-CAT ID (NCID)
    AN00117027
  • Text Lang
    UNK
  • Article Type
    Journal Article
  • ISSN
    0037-4342
  • Data Source
    CJPref  J-STAGE 
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