Table 1 Muscle weight (g) and those ratio (%) in M. quadriceps femoris Table 2 Cross-sectional area (mm2) and those ratio (%) in M, quadriceps femoris Fig. 1 Comparison of cross-sectional area in human muscles.
Table 3 Number of muscle fibers per sq. mm in M. quadriceps femoris Table 4 Total number of muscle fiber and those ratio (%) in M. quadriceps femoris Fig. 2 Comparison of total number of muscle fibers in human muscles
Table 5 Mean fiber size (lcm2) in M, quadriceps femoris Fig. 3 Comparison of muscle fiber size inhuman muscles
Fig. 4 Percentage distribution of muscle fiber size in rectus femoris
Fig. 5 Percentage distribution of muscle fiber size in vastus lateralis
Fig. 6 Percentage distribution of muscle fiber size in vastus medialis
Fig. 7 Percentage distribution of muscle fiber size in vastus intermedius Table 6 Density of muscle fibers in M. quadriceps femoris
2) Ryusi, Y., Hakkinen, K., Kauhanen, H., et al.: Muscle fiber characteristics, muscle cross-sectional area and force production in strength athletes, physically active males and females. Scand. J. Sports Sci. 10:7-15, 1988. 3) Doriguzzi, C., Mongini, T., Palmucci, L., et al.: Quantitative analysis of quadriceps muscle biopsy. Results in healthy females. J. Neurol. Sci. 66:319-326,1984. 4) Mahon, M., Toman, A., Willan, P. L. T., et al.: Variabiritiy of histochemical and
morphometric data from needle biopsy specimens of human quadriceps femors muscle. J. Neurol. Sci.63:85-100,1984. 5) Lexell, J., Henriksson-Larsen, K. and Sjosrom, M.: Distribution of different fiber types in human skeletal muscles. Acta Physiol. Scand. 117:115-122,1983. 10) Duall, E. N.: Kinesiology. The Anatomy of Motion, pp. 51-115, Prentice-Hall Inc, Englewood Cliffs, N. J., 1959. 11) Kohasi, Y.: Histologische untersuchungen der verschieden Skelettmuskeln beim Menschen. 1. Untersuchungen beim Erwachsenen. Okajiras Folia Anat. Jpn. 15:175-188, 1937. 13) Klausen, K., Anderson, L. B, and Pelle, I.: Adaptive changes in work capasity, skeletal muscle capillarization and enzyme levels during training and detraining. Acta Pliysiol. Scand. 113:9-16,1981. 17) Brook, M. H. and Kaiser, K. K.: Muscle fiber types; How many and What kind? Arch. Neurol. 23:369-379,1970. 18) Peter, J. B., Barnard, R. J., Edberton, V. R., et al.: Metabolic profiles of three fiber types of skeletal muscle in guinea pigs and rabbits. Biochemistry 11:2627-2633,1972.
MYOFIBROUS ORGANIZATION IN HUMAN QUADRICEPS FEMORIS MUSCLES Koichi KOBAYASHI Department of Anatomy, School of Medicine, Showa University (Director: Prof. Seiichiro INOKUCHI) Abstract \ Myofibrous organization was studied in human quadriceps femoris muscles (rectus femoris ; RF, vastus lateralis ; VL, vastus medialis ; VM, vastus intermedius ; VI) in 10 human subjects (5 males and 5 females, ages 44-86 years). Muscle samples were embedded in celloidin and sections were stained with hematoxylin and eosin. The following results were obtained. 1) Muscle weights and cross-sectional areas were most predominant in VL, followed in order by VM, VI and RF. 2) Number of muscle fiber per sq mm was most predominant in RF (758), followed by VL (562), VM (474) and VI (461). There was no difference between males and females. 3) VL had the most fibers in cross section, followed by VM, RF and VI. 4) Fiber sizes in VI, VM and VL were about 1300 pmt and differences among those muscles were small. Fibers in RF (about 1000 pmt) were smaller than those in the other three muscles. Quadriceps femoris muscle had larger muscle fiber size than other human muscles. 5) Density of muscle fibers was highest in RF (71%), and in other muscles were about 60%. The results suggest that VL, which had the largest cross-sectional area and total fiber number, functions most predominantly for knee extention. Key words: quadriceps femoris muscle, myofibrous organization