Myofibrous Organization of Human Laryngeal Muscles

Abstract

On the myofibrous organization of the laryngale muscle, the number, the size and the density of muscle fibers were estimated of the transverse muscle sections which were from 4 adult human (2 males and 2 females). The materials were embedded in celloidin and double-stained with hematoxylin and eosin, and the results were compared with the hand muscles and the foot muscles of the same subject.
The following results were obtaited: 1) In thet ransverse section area of muscle belly, cricoarytenoideus muscle, cricoarytenoideus posterior muscle and arytenoideus muscles were the largest area of all, but those group were smaller than hand foot muscle group. 2) In the number of muscle fiber per sq. mm., those groups were in the same range, except for the epiglotticus muscles and thyreo arytenoideus muscle, those larger muscles were in the same range of the foot muscles. 3)In the total number of muscle fibers cricoarytenoideus muscles, cricoarytenoideus posterior muscle and arytenoideus muscles were larger than others, but those group were smaller than foot and hand muscle group. 4) Mean size of muscle fibers were approximately from 1, 200 to 2, 500, epiglotticus muscle were the largest size of all, and that those were as same as the larger muscles of foot and hand. 5) On the muscle fiber density, epiglotticus group was about 30% on the average, others were from about 60 to 80%, the range of those average were within the range of foot and hand muscle.