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The os incae.

R Shapiro, F Robinson

    AJR. American Journal of Roentgenology
    |September 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    The interparietal bone, or os incae, normally fuses during skull development. Variations in this fusion process can lead to distinct anatomical forms of the os incae in mammals.

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    Area of Science:

    • Anatomy
    • Osteology
    • Human Evolution

    Background:

    • The os incae is a bone feature in reptilian and mammalian skulls.
    • It develops from intramembranous ossification centers posterior to the parietal bones.
    • In humans, the interparietal bone typically arises from a single ossification center and fuses with the occipital bone.

    Purpose of the Study:

    • To describe the developmental anatomy of the os incae.
    • To explain the normal fusion process of the interparietal bone.
    • To detail the variations resulting from failed fusion.

    Main Methods:

    • Descriptive anatomical analysis.
    • Review of ossification patterns.
    • Comparative osteology.

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    Main Results:

    • The os incae originates from intramembranous ossification.
    • Normally, a single ossific focus fuses with the supraoccipital segment.
    • Multiple ossification centers can lead to unfused interparietal bone, forming various types of os incae.

    Conclusions:

    • The os incae's development is a key aspect of skull anatomy.
    • Variations in os incae formation are due to anomalies in ossification center fusion.
    • Understanding these variations is important for anatomical and evolutionary studies.