腹直筋筋線維径の成長期における変化

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The development of the muscle fiber diameter by 190 specimens of the m. rectus abdominis in the human growth stage was examined and compared with that of the other muscles and of the muscle in adult. A micropattern analyzer was used in measurement of muscle fiber diameter in the stained section.<BR>The mean value of diameter was the smallest in 1 year old among the all age levels examined, but it increases along with age, reaching the highest value at 18-19 years old by male and at 16-18 years old by female. Comparing the diameter of muscle fiber of this muscle with that of the other muscles, we observed that this muscle showed similar value of diameter to the diaphragm in lower age and to the upper extremity muscle above 9 year old. And compared the muscle fiber diameter of this muscle of the youth in the growth stage with that of the adult, we found that the diameter of the youth was smaller than that of the adult by male and the diameter in the case of the age levels covering from 16 to 18 was the largest throughout all the age levels of the female, in which that of the nulli-parous corresponded to that of 11-15 years old and the parous to 8-10 years old. The differ-ence of diameters between male and female was discernible in 1-7 and 15-19 years old, and was not seen in 8-14 years old.<BR>These findings suggest that the developmental pattern of the muscle fiber in the growth stage of this muscle differs from that of the other muscles and that the enlargement factor of muscle fiber of this muscle differ from that of the adult. And also, these findings show that the difference between the diameter in the case of the both sexes observed before the secondary sex character appeared.
学校法人昭和大学・昭和医学会の論文

腹直筋筋線維径の成長期における変化

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