Abstract
Models of mastication require knowledge of fiber lengths and physiological cross-sectional area (PCS): a proxy for muscle force. Yet only a small number of macaques of various species, ages, and sexes inform the previous standards for masseter muscle architecture. I dissected 36 masseters from 30 adult females of 3 macaque species—Macaca fascicularis, M. mulatta, M. nemestrina—using gross and chemical techniques and calculated PCS. These macaques have mechanically similar dietary niches and exhibit no significant difference in masseter architecture or fiber length. Intramuscular tendons effectively compartmentalize macaque masseters from medial to lateral. Fiber lengths vary by muscle subsection but are relatively conservative among species. Fiber length does not scale with body size (mass) or masseter muscle mass. However, PCS scales isometrically with body size; larger animals have greater force production capabilities. PCS scales positively allometrically with facial size; animals with more prognathic faces and taller mandibular corpora have greater PCS, and hence force, values. This positive allometry counters the less efficient positioning of masseter muscles in longer-faced animals. In each case, differences in PCS among species result from differences in muscle mass not fiber length. Masseter PCS is only weakly correlated with bone proxies previously used to estimate muscle force. Thus predictions of muscle force from bone parameters will entail large margins of errors and should be used with caution.
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REFERENCES
Albrecht, G. H. (1978). The craniofacial morphology of the Sulawesi macaques: Multivariate approaches to biological problems. Contrib. to Primatol. 13: 1–151.
Antón, S.C. (1990). Neandertals and the anterior dental loading hypothesis: A biomechanical evaluation of bite force production. Kroeber Anthropol. Soc. Papers 71–72: 67–76.
Antón, S. C. (1993). Internal masticatory muscle architecture in the Japanese macaque and its influence on bony morphology. Am. J. Phys. Anthrop. Supplement 16:50 (abstract).
Antón, S. C. (1994a). Masticatory Muscle Architecture and Bone Morphology in Primates, PhD dissertation, Department of Anthropology, University of California, Berkeley.
Antón, S. C. (1994b). Mechanical and other perspectives on Neandertal craniofacial morphology. In Corruccini, R.S., and Ciochon, R. L (eds.), Integrative Pathways to the Past: Paleoanthropological Advances in Honor of F. Clark Howell, Prentice Hall, New Jersey, pp. 677–695.
Antón, S. C. (1996a). Cranial adaptation to a high attrition diet in Japanese macaques. Int. J. Primatol. 17: 401–427.
Antón, S. C. (1996b). Tendon associated bone features of the masticatory system in Neandertals. J.Hum. Evol. 31:391–408.
Bernstein, I. S. (1967). A field study of the pigtail monkey (Macaca nemestrina). Primates 8: 217–228.
Bouvier, M. (1986). A biomechanical analysis of mandibular scaling in Old World monkeys. Am. J. Phys. Anthrop. 69: 474–482.
Bouvier, M., and Tsang, S. M. (1990). Comparison of muscle mass and force ratios in New and Old World monkeys. Am. J. Phys. Anthrop. 82: 509–515.
Buchner, H. (1877). Kritische und experimentelle Studien ueber den Zusammenhalt des Hueftgelenks waehrend des Lebens in alien normalen Faellen. Arch. Anat. Physiol. 1877: 22–45.
Cachel, S. M. (1979). A functional analysis of the primate masticatory system and the origin of the anthropoid post-orbital septum. Am. J. Phys. Anthrop. 50: 1–18.
Cachel, S. M.(1984). Growth allometry in primate masticatory muscles. Archs. Oral Biol. 29: 287–293.
Carlsoo, S. (1952). Nervous coordination and mechanical function of mandibular elevators: An electromyographic study of the activity and anatomic analysis of the mechanics of the muscles. Ada Odont. Scand. (Suppl. 11).
Cheverud, J. M. (1981). Epiphyseal union and dental eruption in Macaca mulatta. Am. J. Phys. Anthrop. 56: 157–167.
Crockett, C. M., and Wilson, W. L. (1980). The ecological separation of Macaca nemestrina and M.fascicularis. In Lindburg, D. G. (ed.), The Macaques: Studies in Ecology, Behavior and Evolution, Van Nostrand Reinhold, San Francisco, pp. 148–181.
Cronin, J. E., Cann, R., and Sarich, V. M. (1980). Molecular evolution and systematics of the genus Macaca. In Lindburg, D. G. (ed.), The Macaques: Studies in Ecology, Behavior and Evolution, Van Nostrand Reinhold, San Francisco, pp. 31–51.
Daegling, D. J. (1989). Biomechanics of cross-sectional size and shape in the hominoid mandibular corpus. Am. J. Phys. Anthrop. 80: 91–106.
Daegling, D. J. (1992). Mandibular morphology and diet in the genus. Cebus. Int. J. Primatol. 13: 545–570.
Dechow, P. C. and Carlson, D. S. (1990) Occlusal force and craniofacial biomechanics during growth in Rhesus monkeys. Am. J. Phys. Anthrop. 83: 219–237.
Demes, B., and Creel, N. (1988). Bite force, diet and cranial morphology of fossil hominids. J. Hum. Evol. 17: 657–670.
Emerson, S. B., and Radinsky, L. B. (1980). Functional analysis of sabertooth cranial morphology. Paleobiol. 6: 295–312.
Gans, C. (1982). Fiber architecture and muscle function. Exer. Sport Sci. Rev. 10: 160–207.
Gans, C., and de Vree, F. (1987). Functional bases of fiber length and angulation in muscle. J. Morph. 192: 63–85.
Gaspard, M., Laison, F., and Mailland, M. (1973a). Organisation architecturale et texture du muscle masseter chez les Primates et l'homme. J. Biol. Buccale. 1: 7–20.
Gaspard, M., Laison, F., and Mailland, M. (1973b). Organisation architecturale du muscle temporal et des faisceaux de transition du complexe temporo-masseterin chez les Primates et l'homme. J. Biol. Buccale 1: 171–196.
Gaspard, M., Laison, F., and Mailland, M. (1973c). Organisation architecturale et texture des muscles pterygoidiens chez les Primates superieurs. J. Biol. Buccale 1: 215–233.
Gaspard, M., Laison, F., and Mailland, M. (1973d). Organisation architecturale et texture des muscles pterygoidiens chez l'homme. J. Biol. Buccale 1: 353–366.
Hatcher, D. C., Faulkner, M. G., and Hay, A. (1986). Development of mechanical and mathematical models to study temporomandibular joint loading. J. Pros. Dent. 55: 377–384.
Herring, S. W., Grimm, A. F., and Grimm, B. R. (1979) Functional heterogeneity in a multipinnate muscle. Am. J. Anat. 154: 563–576.
Hiiemae, K. M. (1971). The structure and function of the jaw muscles in the rat (Rattus norvegicus L.) III. The mechanics of the muscles. Zool. J. Linn. Soc. 50: 111–132.
Hill, W. C. O. (1974). Primates: Comparative Anatomy and Taxonomy VII: Cynopithecinae. Edinburgh University Press, Edinburgh.
Honee, G. L. J. M. (1972). The anatomy of the lateral pterygoid muscle. Acta Morphol. Neerl.-Scand. 10: 331–340.
Hylander, W. L. (1975). The human mandible: Lever or link? Am. J. Phys. Anthrop. 43: 227–242.
Hylander, W. L. (1977). Morphological changes in human teeth and jaws in a high-attrition environment. In Dahlberg A. A., and Graber, T. M. (eds.), Orofacial Growth and Development, Mouton Publishers, Paris, pp. 301–330.
Hylander W. L. (1985) Mandibular function and biomechanical stress and scaling. Am. Zool. 25: 315–330.
Hylander, W. L. (1988). Implications of in vivo experiments for interpreting the functional significance of “robust” australopithecine jaws. In Grine, F. E. (ed.), Evolutionary History of the “Robust”Australopithecines, Aldine de Gruyter, New York, pp. 55–83.
Hylander, W. L. and Johnson, K. R. (1994). Jaw muscle function and wishboning of the mandible during mastication in macaques and baboons. Am. J. Phys. Anthrop. 94: 523–48.
Iwamoto, M. (1967) Morphological studies of Macaca fuscata: VI. Somatometry. Primates 8:217–228.
Kallfelz-Klemish, C. F., and Franciscus, R. G. (1997). Static bite force production in Neandertals and modern humans. Am. J. Phys. Anthrop. Suppl. 24: 140 (abstract).
Kay, R. F. (1975) The functional adaptations of primate molar teeth. Am. J. Phys. Anthrop 43: 195–216.
Kiltie, R. A. (1982) Bite force as a basis for niche differentiation between rain forest peccaries (Tayassu tajacu and T. pecari). Biotropica 14: 188–195.
Koolstra, J. H., van Eijden, T. M. G. J., Weijs, W. A., and Naeije, M. (1988). A three-dimensional mathematical model of the human masticatory system predicting maximum possible bite forces. J.Biomech. 21: 563–576.
Loeb, G. E., and Gans, C. (1986). Electromyography for Experimentalists, University of Chicago Press, Chicago.
Morales, J. C. and Melnick, D. J. (1998) Phylogenetic relationships of the macaques (Cercopithecidae: Macaca) as revealed by high resolution restriction site mapping of mitochondrial ribosomal genes. J. Hum. Evol. 34: 1–23.
Preuschoft, H., Demes, B., Meyer, M., and Bar, H. F. (1986). The biomechanical principles realised in the upper jaw of long-snouted primates. In Else, J. G., and Lee, P. C. (eds.), Primate Evolution, Cambridge University Press, New York, pp. 249–264.
Prychodko, W., Goodman, M., Singal, B. M., Wess, M. L., Ishimoto, G., and Tanaka, T. (1971). Starch-gel electrophoretic variants of erythrocyte 6-phosphogluconate dehydrogenase in Asian macaques. Primates 12: 175–182.
Radinsky, L. (1981). Evolution of skull shape in carnivores: 1 Representative modern carnivores. Biol. J. Linn. Soc. 15: 369–388.
Radinsky, L. (1984) Ontogeny and phylogeny in horse skull evolution. Evolution 38: 1–15.
Ravosa, M. J. (1996) Jaw morphology and function in living and fossil Old World monkeys. Int. J. Primatol. 17: 909–932.
Rodman, P. S. (1991). Structural differentiation of microhabitats of sympatric Macaca fascicularis and M. nemestrina in East Kalimantan, Indonesia. Int. J. Primatol. 12: 357–375.
Schumacher, G. H. (1961). Funktionelle Morphologie der Kaumuskulatur. Jena: VEB Gustav Fischer Verlag.
Strzalko, J. and Malinowski, A. (1972). The muscles of mastication and cranial proportions in primates. Folia Morphol. 31: 207–213.
Takahashi, L. K. and Pan, R. (1994). Mandibular morpholometrics among macaques: The case of Macaca thibetana. Int. J. Primatol. 15: 597–621.
Tanabe, Y, Ogawa, M., and Nozawa, K. (1974). Polymorphism of thyroxine-binding prealbumin (TBPA) in primate species. Japan. J. Gen. 49: 265–273.
Tattersall, I. (1973). Cranial anatomy of the Archaeolemurinae (Lemuroidea, Primates). Am. Mus. Nat. Hist. Anthrop. Papers 52: 1–110.
Throckmorton, G. S., and Throckmorton, L. S. (1985). Quantitative calculations of temporomandibular joint reaction forces I. The importance of the magnitude of the jaw muscle forces. J. Biomech. 18: 445–452.
Turnbull, W. D. (1970). Mammalian masticatory apparatus. Fieldiana Geol. 18: 1–356.
van der Klaauw, C. J. (1963). Projections, deepenings and undulations of the surface of the skull in relation to the attachment of muscles. Verhandelingen der Koninklijke Nederlandse Akademie van Wetenschappen, Afd. Natuurkunde 55: 1–270.
van Eijden, T. M. G. J., Blanksma, N. G., and Brugman, P. (1993). Amplitude and timing of EMG activity in the human masseter muscle during selected motor tasks. J. Dent. Res. 72: 599–606.
Vinyard, C. J. and Ravosa, M. J. (1998) Ontogeny, function, and scaling of the mandibular symphysis in Papionin Primates. J. Morph. 235: 157–175.
Weber, E. F. (1846). Ueber die laegenverhaeltnisse der Fleischfasern der Muskeln im Allgemeinen. Berichte ueber die Verhandlungen der koeniglich saechisichen Gesselschaft der Wissenschaften zu Leipsig. Mathematische-Physische Classe, II: 63.
Weijs, W. A., and Dantuma, R. (1975). Electromyography and mechanics of mastication in the albino rat. J. Morphol. 146: 1–34.
Weijs, W. A., and Hillen, B. (1984a). Relationship between the physiologic cross-section of the human jaw muscles and their cross-sectional area in computer tomograms. Acta. Anat. 118: 128–138.
Weijs, W. A., and Hillen, B.(1984b). Relationships between masticatory muscle cross-section and skull shape. J. Dent. Res. 63: 1154–1157.
Weijs, W. A., and Hillen, B. (1985a). Physiologic cross-section of the human jaw muscles. Acta. Anat. 121:31–35.
Weijs, W. A., and Hillen, B. (1985b). Cross-sectional areas and estimated intrinsic strength of the human jaw muscles. Acta. Morphol. Neerl.-Scand. 23: 267–274.
Weiss, M. L., Goodman, M., Prychodko, W., and Tanaka, T. (1971). Species and geographic distribution patterns of the macaque prealbumin polymorphism. Primates 12: 75–80.
Weiss, M. L., Goodman, M., Prychodko, W., Moore, G. W., and Tanaka, T. (1973). An analysis of macaque systematics using gene frequency data. J. Hum. Evol. 2: 213–226.
Wheatley, B. P. (1980). Feeding and ranging of East Bornean Macaca fascicularis. In Lindburg, D. G. (ed.), The Macaques: Studies in Ecology, Behavior and Evolution, Van Nostrand Reinhold, San Francisco, pp. 215–246.
Yoshikawa, T. (1963). The lamination of the M. masseter of the crab-eating monkey, orang-utan and gorilla. Primates 3: 81 (abstract).
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Antón, S.C. Macaque Masseter Muscle: Internal Architecture, Fiber Length and Cross-Sectional Area. International Journal of Primatology 20, 441–462 (1999). https://doi.org/10.1023/A:1020509006259
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DOI: https://doi.org/10.1023/A:1020509006259