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Interparietal bones in Nigerian skulls.

S K Saxena1, D S Chowdhary, S P Jain

  • 1Department of Anatomy, University of Jos, Nigeria.

Journal of Anatomy
|February 1, 1986
PubMed
Summary
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This study examined 40 Nigerian skulls for interparietal and pre-interparietal bones. Findings revealed a low prevalence of interparietal bones (2.5%) and a higher incidence of pre-interparietal bones (10-12.5%).

Area of Science:

  • Anatomy
  • Anthropology
  • Osteology

Background:

  • Accessory bones in the human skull can offer insights into evolutionary and developmental processes.
  • The interparietal bone and pre-interparietal bones are ossicles found in the posterior part of the skull.
  • Variations in these bones are documented across different populations.

Purpose of the Study:

  • To investigate the prevalence and morphological variations of interparietal and pre-interparietal bones in an adult Nigerian population.
  • To contribute to the existing literature on cranial anatomical variations.

Main Methods:

  • A sample of 40 adult Nigerian skulls was examined.
  • Macroscopic examination was performed to identify and count interparietal and pre-interparietal bones.

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  • The frequency of occurrence for each type of accessory bone was calculated.

    • Main Results:

    • One instance of an interparietal bone was observed, representing 2.5% of the series.
    • A single pre-interparietal bone was found in 10% of the skulls.
    • Multiple pre-interparietal bones were present in 2.5% of the skulls, totaling 12.5% for all pre-interparietal bone occurrences.

    Conclusions:

    • The study highlights the presence of accessory ossicles in the Nigerian population, with pre-interparietal bones being more common than interparietal bones.
    • These findings add to the understanding of cranial anatomical diversity within African populations.
    • Further research with larger sample sizes is recommended to explore geographical and ethnic variations.