STUDY OF THE MYOFIBROUS COMPOSITION OF PHARYNGEAL CONSTRICTOR MUSCLE FROM MAN

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  • ヒト咽頭収縮筋筋線維構成に関する機能解剖学的研究

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Myofibrous composition of the pharyngeal constrictor muscle from man was investigated for functional analysis of its 3 parts, superior, middle and inferior. The muscles were obtained from 40 humans (23 males and 17 females ; average, 71 years) . Muscle slices of three parts of the muscle belly were embedded in celloidin, and the thin sections were stained with H.E. Results : 1) The thickness of the muscle layer was greatest in the inferior part and least in the middle part. Tendency of thickness to decrease with age was evident in all parts, and this was greatest in the middle part. 2) The numbers of muscle fibers per square millimeter decreased in the order of superior, middle and inferior parts ; and decreased in old men in all three parts. 3) The mean size of the muscle fibers was greater in the order of inferior, middle and superior. Size was greatest at age 60, and least at age 90 in males ; it was greatest at age 90, and least at age 60 in females. 4) The density of muscle fibers was about 60% in all 3 parts ; it was lowest at age 90 in males and highest at age 90 in females. 5) Pathological changes of muscle fibers were most frequent in the inferior part, and more frequent in old men than in younger. 6) Compared to laryngeal muscles, the muscle fibers of pharyngeal constrictor muscles were greater in number per square millimeter, lower in density and had more connective tissue in esch layer.

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