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Population differences in cellularity of the mastoid process.

F P Schulter-Ellis

    Acta Oto-Laryngologica
    |May 1, 1979
    PubMed
    Summary

    Mastoid process air cell variation was studied in human crania. Genetic factors likely influence mastoid bone cellularity, with differences observed across populations and sexes.

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    Area of Science:

    • Anthropology
    • Anatomy
    • Genetics

    Background:

    • The mastoid process, a part of the temporal bone, contains an air cell system crucial for auditory function and cranial integrity.
    • Variations in mastoid pneumatization are observed across human populations and sexes, suggesting potential genetic and environmental influences.

    Purpose of the Study:

    • To investigate the variation in the mastoid process air cell system across four distinct human skeletal populations.
    • To determine the influence of sex on mastoid process cellularity and asymmetry within these populations.

    Main Methods:

    • Radiographic analysis of adult crania from four human skeletal population samples.
    • Classification of mastoid processes into six types based on cellularity: sclerotic, diploic, diplo-pneumatic, pneumatic, and highly pneumatic.

    Main Results:

    • A significantly lower frequency of non-pneumatized (acellular) mastoid processes was found in Eskimos compared to other populations.
    • Female crania exhibited fewer acellular processes than male crania, with statistically significant differences in Whites, Eskimos, and total samples.
    • Asymmetry in mastoid process type was significant only in Whites and Eskimos.

    Conclusions:

    • The study provides evidence for a genetic factor influencing the degree of mastoid process cellularity.
    • Observed variations in mastoid pneumatization highlight population-specific and sex-related differences in skeletal development.

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