九州日本人喉頭の人種解剖学的研究

抄録

Systematic studies on the larynx in Kyushu Japanese (* 30, * 20) and comparison with other races were made and the following results were obtained. 1. Laryngeal cartilages : The maximal diameter of the larynx and the size of each part of the- thyroid cartilage were, larger in the males than in the females except the degree of inclination of the superior cornu, anterior angle of the thyroid cartilage and the angle of the inferior thyroidt notch, in general, these were smaller than those of the European, about equal or somewhat smaller than those of the Chinese and about equal to those of the Japanese (OZEKI) from other districts- The sizes of each part of the cricoid cartilage and the arytenoid cartilage, of the male were also larger than those of the female. The size of the cricoid cartilage of the male and the female were somewhat larger than that of the Japanese (OZEKI) from other districts and of the aborigins of Formosa, and in the male it was smaller than that of the Chinese. 2. Ossification of laryngeal cartilages: The degree of ossification in each cartilage showed a- definite order and type being parallel to the age. Only thyroid cartilage showed remarkable sexual difference. In the evalution of the ossification phenomenon, X-ray study was somewhat superior than Gross examination. 3. Laryngeal muscles: Study of cricothyroid muscles showed the diastasis type in the majority of the cases as aeen among other races, the incidence being somewhat smaller that of the European, and larger than that of the Chinese. In both sexes, in a majority of the cases, the study of thyro- arytenoid muscles showed horizontal type, whereas the vertical type was common among the Euro- pean and the Chinese. The attahement of the thyro-arytenoid muscle and the arytenoid muscle was. found in the highest rate (96%) among the people of Kyushu district, 4. Laryngeal cavity: The size of each part of the laryngeal cavity was found smaller in both. sexes than that of the European in general and in the male somewhat smaller than that of the Chinese. In sexual distinction the male was superior to the female as in the cases of the European and the Japanese from other dirtricts. In respect to the location of the small sack of larynx an, half or a majority of the people of Kyushu district and the Chinese also had it in the middle and- very seldom in the rear in both sexes while the Japanese (OZEKI) from other districts had it in, the rear and the negroes and the European in the front.