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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Human evolution 3 (1988), S. 343-350 
    ISSN: 1824-310X
    Keywords: Supraorbital ridges ; masticatory force ; temporalis muscle ; mandible ; primates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The supraorbital ridge formation in apes is a result of the traction of the masticatory force exerted by the anterior part of the temporalis muscle. This force varies inversely with the ratio of the power arm to the load arm of the mandible. The smaller this ratio, the greater the anterior part of the temporalis muscle and the larger the supraorbital ridge. The size of the ridge is independent of the actual size of the skull. The orang has a larger skull but the smallest brow ridge of the three species studied: gorilla, chimpanzee and orang. Pearson’s correlation coefficient shows a positive correlation between the anterior temporalis muscle and the ridge as well as between the ridge/sinus and anterior/whole temporalis muscle. The correlation is negative between the power/load arms and anterior/whole muscle and also between the power/load arms and the ridge/sinus ratio.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Human evolution 3 (1988), S. 351-356 
    ISSN: 1824-310X
    Keywords: Supraorbital ridges ; mastication ; temporalis muscle ; mandible ; St. Lawrence Eskimos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thirteen adult male skulls of St. Lawrence Island Eskimos were studied to determine the factor or factors responsible for the development of the supraorbital ridges. Results showed that the determining factor is the ratio of the power arm to the load arm of the mandible. The smaller this ratio, the greater the traction force exerted by the anterior temporalis muscle and the greater the supraorbital ridge. Pearson’s correlation coefficient shows two positive correlations, i.e. between the anterior temporalis muscle and the ridge and between the ridge/sinus and the anterior/whole temporalis muscle. Conversely, there is a negative correlation between the power/load arm and the muscle ratio as well as between the power/load arm ratio and the ridge/sinus ratio.
    Type of Medium: Electronic Resource
    Signatur Availability
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