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occipital crest

n :  either of the two ridges on the occipital bone connecting the occipital protuberances and foramen magnum:  a  :  a median ridge on the outer surface of the occipital bone that with the external occipital protuberance gives attachment to the ligamentum nuchae - called also external occipital crest , median nuchal line   b  :  a median ridge similarly situated on the inner surface of the occipital bone that bifurcates near the foramen magnum to give attachment to the falx cerebelli - called also internal occipital crest  .

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