Analysis of the Tendinous Structure in Human Masticatory Muscles

Abstract

In the masticatory muscles, the development of bundles of the tendon was examined: they were composed of many collagen fibers and a few elastic fibers. In the masseter muscle, the property of the tendon differs in the distribution and size of collagen fibers and elastic fibers in comparison with those of other masticatory muscles. This difference is concerned with the kinetic force for the stress or the stretch of each tendon and muscle during jaw movement.

Tonic Fiber in Mauremys(Clemmys) japonica Jaw Muscle

“…Throckmorton and Saubert (1982) reported that there were various muscle fiber types of jaw muscles in lizard with respect to the metabolic activities. Sato et al (1992) also reported various fiber types of jaw muscles in alligator by the classifications using previous histochemical methods in contrast to that of mammals (Maxell et a!., 1977, 1979Ringqvist, 1973Ringqvist, , 1974Ringqvist et al, 1977;Schiaffino, 1974). In our histochemical results, there are four fiber types as the A group of the MCJ in jaw muscles (FG, FOG, SO and tonic fiber types) which correspond to that of previous fiber types in the alligator (Sato et al, 1992).…”

“…Type 6 fibers of the MDM and MAME of the MCJ stain only weakly for SDH and Sudan black B and do not stain myosin ATPase at pH 9.4. Such fibers somewhat resemble to those of type in jaw muscles as distinguished by Throckmorton and Saubert (1982) and resemble the type 1 muscle fibers of alligator jaw muscles (Sato et al, 1992) which stain intense for a-GPDH and with PAS. They show very high percentage in the MDM and MAME of the MCJ.…”

“…Sato et al (1992) also reported various fiber types of jaw muscles in alligator by the classifications using previous histochemical methods in contrast to that of mammals (Maxell et a!., 1977, 1979Ringqvist, 1973Ringqvist, , 1974Ringqvist et al, 1977;Schiaffino, 1974). In our histochemical results, there are four fiber types as the A group of the MCJ in jaw muscles (FG, FOG, SO and tonic fiber types) which correspond to that of previous fiber types in the alligator (Sato et al, 1992). Especially, "tonic" muscle fibers of jaw muscles in a turtle, however, very low percentage compositions, closely resemble to those of tonic fibers of the limb muscles in the lizard (Glesson et al, 1980), in avian skeletal muscle (Talesara and Goldspink, 1978;George, 1985, 1986;Suzuki et al, 1985;Hikida, 1987;Suzuki, 1990;Matthews et al, 1990), and in frog skeletal muscle (Engel and Irwin, 1967).…”

“…Previous histochemical analyses in the jaw muscles of a turtle have utilized reactions and staining techniques for myosin-ATPase, SDH, mitochondrial Ca-ATPase, Sudan black B, oc-GPDH and PAS to characterize muscle fiber types for contraction speed (Padykula and Herman, 1955), oxidative capacities (Novikoff et al, 1961), glycolytic activity (Wattenberg and Leong, 1960) and respiratory capacities (Gauthier and Padykula, 1966). Histochemical profiles of fiber types in jaw muscles of mammals (Suzuki, 1977; Clark and Luschei, 1981; Rowlerson et al, 1983;Taylor et al, 1973;Lindman et al, 1986), alligators (Sato et al, 1992), and a lizards (Throckmorton and Saubert, 1982) have provided information about contraction speed and metabolic properties in these animals. Histochemical properties of individual jaw muscles, however, remain unknown.…”

Tenomodulin regulated the compartments of embryonic and early postnatal mouse masseter muscle

“…The masseter muscle (MM) is composed of a laminated muscle mass with superficial, intermediate and deep layers that have different functions (Toldt, 1905;Schumacher, 1961;Yoshikawa et al, 1961;Heinze, 1963a,b;Sato et al, 1992;Sasaki et al, 2001). The complex masseter movement is associated with mastication with biomechanical actions of the individual masseteric compartments (English et al, 1999).…”