Download Biomechanics of the Primate Skull Base by Brigitte Demes PDF

By Brigitte Demes

In the quest for causes for modifications within the form of skulls and their phylogenetic improvement, the morphology of the cranium has to be obvious in connec­ tion with the features it has to accomplish. The cranium encloses the mind and the experience organs and gives them with actual safeguard. It additionally homes the preliminary components of the respiration and digestive platforms and including the jaws constitutes a device able to slicing and grinding meals. The cranium has to be in a position to face up to forces imposed upon it by way of chewing, by means of move of the top, through the load of the top itself, and via influence loadings. An research of the criteria influencing the form of the cranium has take into consideration not just the above-mentioned features. the form additionally de­ pends at the phylogenetic background 9f the species involved, which prescribes a simple bauplan and locations regulations at the quantity to which services can impression the layout of structural devices. the probabilities for diversifications in cranium form also are constrained via ontogenetic improvement, because the form of the grownup cranium is the results of intermediate levels of improvement, at every one of which the cranium was once a functioning unit. physique measurement and absolute and relative measurement of the experience organs within the head additionally play an immense position in deciding upon the form of the skull.

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J Hum Evol 11 :687-691 Demes B, Preuschoft H, Wolff JEA (1984) Stress-strength relationships in the mandibles of hominoids. In: Chivers DJ, Wood BA, Bilsborough A (eds) Food acquisition and processing in primates. Plenum, New York, pp 369-390 Dempster WT (1967) Correlation of types of cortical grain structure with architectural features of the human skull. Am J Anat 120:7-32 DuBrul LE, Laskin DM (1961) Preadaptive potentialities of the mammalian skull: an experiment in growth and form. Am J Anat 109: 117-132 Ehara A, Seiler R (1970) Die Strukturen der Uberaugenregion bei Primaten.

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7), 42 Fig. 26a--c. Isochromatic fringes on the posterior wall of a shell loaded (arrows) by the equivalents of the muscle and joint forces which act in the occipital region. a Shell with an angled profile of the occipital wall, loaded at the occipital condyles; b the wall is thickened at the angle; and c additional loads in the form of tensile strings. Numbers, fringe orders the same form was equipped with a thickening of the wall at the site of the angle. If loaded at the" occipital condyles", the shell without a torus-like brace does not show any stresses at the angle (Fig.

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