哺乳動物内喉頭筋及び喉頭関節の比較解剖生理学的研究

DOI
  • 高瀬 晴朗
    Department of Otorhinolaryngology Faculty of Medicine, Kurume University

書誌事項

タイトル別名
  • Studies on the Intrinsic Laryngeal Muscles of Mammals
  • Comparative Anatomy and Pllysiology

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抄録

There were many stadies on the intrinsic laryngeal muscles, cartilag es or joints of the larynx. and many information about relationship between the movement of the vocal cords or joints and the function of the intrinsic laryngeal muscles were obtained from them. But, several problems are yet remained in dispute, for example the position of the vocal cords in recurrent laryngeal nerve paralysis or in cadavers, the roll of each muscles in movements of the cricoarytenoid or cricothyroid joint, differences of the movements of vocal cords according to animals and so on. In order to contribute to solve these problems, three fundamental studies were performed.<BR>Part I. Comparative Anatomy of the Intrinsic Laryngeal Muscles of Mammals<BR>Intrinsic laryngeal muscles of the man, monkey, cat, dog, goat, sheep, rabbit, cow, horse and pig were studied comparatively under a binocular microscope, and the function of them were discussed from those anatomical arrangement. The results were summarized as followes<BR>(1) There were differences in running of the cricothyroid muscle among animals, and the roll of this muscle in movement of the vocal cord was presumed to vary according to the direction of running of this muscle.<BR>(2) No significant variety was found in the posterior cricoarytenoid muscle in all animals investigated.<BR>(3) In the lateral cricoarytnoid muscle no remarkable difference was observed according to animals, though it was suggested that the power of this muscle to adduct the vocal cord was influenced by position or area of the origin and end of this muscle.<BR>(4) There were remarkale varieties in the interarytenoid muscle according to animals and individuals. The function of this muscle was presumed to pull the arytenoid cartilages medially.<BR>However, the cartilagenous portion of the glottis seemed to be closed not completely b y contraction of this muscle except in the man, monkey and cat.<BR>(5) Shape of the thyroarytenoid muscle also varied mar kedly according to animals. Muscle fibres which were called the aryvocal muscle (Goerttler) were found only in man, and muscle fiberes that arised from the Conus elasticus and was inserted into the arytenoid cartilage were found in every animal.<BR>Part II. Comparative Anatomy of the Cricoarytenoid Joint of Mammals<BR>In animals investigated in Part I, the cricoarytenoid joint and its appendices were studied anatomically with a binocular microscope. The following results were obtained.<BR>(1) In all animals the cricoarytenoid joint was an Articularis cylin droideus which consisted of a Fossa articularis, Processus articularis, capsule, ligaments and a small amount of synovia.<BR>(2) The shape of the fossa varied according to animals, and it was thought that t he range of movement of the cricoarytenoid joint was influenced by the depth of the fossa.<BR>(3) The joint surface of the cricoid cartilage was oval in shape. It was reasonable to presume that the larger the angle of inclination of this surface, which differed with animals, was the more strongly the glottis was closed.<BR>(4) The ratio of the distance between both arytenoid cartilages to size of the larynx varied according to animals and also to individuals, and it was suggested that the larger this ratio was the more the interarytenoid muscle contributed to closure of the glottis.<BR>(5) The ligaments seemed to be of protective function with l imitation of excessive movement of the joint.<BR>(6) It was reasonably concluded that the position of the vocal cords in cadavers varied with the distance between the both arytenoid cartilages and also with the angle of inclination of the joint surface. Hence the varieties of position of cords practically seen in corpses.<BR>Part III., Study on Function of the Intrinsic Laryngeal Muscles

収録刊行物

  • 耳鼻と臨床

    耳鼻と臨床 10 (Supplement1), 18-58, 1964

    JIBI TO RINSHO KAI

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