The occipital sinus

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✓ Fresh dural preparations and dried occipital bones from 200 adult cadavers were examined to define the characteristics of the occipital sinus. The occipital sinus was found to be present in 64.5% cases. Different morphological types are classified into the following: median occipital sinus (35%), double occipital sinus (22.5%), left occipital sinus (4%), and right occipital sinus (3%). Communications with the confluence, superior sagittal, straight, transverse, and sigmoid sinuses are described. The normal findings and some notable anomalies are discussed in the light of the available literature.

Article Information

Address reprint requests to: Dr. A. C. Das, Department of Anatomy, K.G. Medical College, Lucknow University, Lucknow, India.

© AANS, except where prohibited by US copyright law.

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Figures

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    Four occipital bones each with a broad median (arrows) for the occipital sinus replacing the internal occipital crest.

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    Four occipital bones each with a complete or partial bilateral groove (arrows) for double sinuses. The lower ends of the grooves are extending up to the respective jugular notches.

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    Four occipital bones with complete bilateral grooves for double occipital sinuses.

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    Three occipital bones with grooves for a right-sided occipital sinus.

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    Photograph of the posterior cranial fossa containing right and left transverse sinuses, part of the superior sagittal sinus, and double occipital sinuses (arrows) which have been dissected and laid open.

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    Photograph of the right and left transverse sinuses and undissected complete double occipital sinuses (arrows) as they appear after removal of the tentorium cerebelli.

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