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Related Experiment Videos

Emissary occipital foramen.

P K Sharma, V K Malhotra, S P Tewari

    Anatomischer Anzeiger
    |January 1, 1986
    PubMed
    Summary

    A rare anatomical variation was found in one of 214 skulls: a small foramen behind the foramen magnum. This opening likely allowed an emissary vein to connect the occipital sinus with the suboccipital venous plexus.

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    Area of Science:

    • Anatomy
    • Osteology
    • Vascular anatomy

    Background:

    • Emissary veins are valveless venous channels connecting intracranial and extracranial circulation.
    • The occipital emissary vein is a rare emissary vein that transmits a vein connecting the superior sagittal sinus or transverse sinuses to the occipital veins.
    • Variations in cranial foramina can impact venous drainage pathways.

    Purpose of the Study:

    • To report a rare anatomical finding of a foramen for an emissary vein in the occipital bone.
    • To describe the potential vascular connections facilitated by this foramen.

    Main Methods:

    • Macroscopic examination of 214 human skulls.
    • Identification and description of foramina in the squamous part of the occipital bone.

    Main Results:

    • A single small foramen was identified in the occipital bone of one skull, located posterior to the foramen magnum.
    • This foramen was likely traversed by an emissary vein.
    • The vein potentially connected the occipital sinus with the suboccipital venous plexus.

    Conclusions:

    • This finding represents a rare anatomical variation in cranial venous pathways.
    • Such variations highlight the importance of detailed anatomical study for understanding individual differences in venous drainage.

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