The part of the dura that extends into the longitudinal fissure is the falx cerebri.

Name: The part of the dura that extends into the longitudinal fissure is the falx cerebri.
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The falx cerebri is a fold or extension of the dura mater, the outermost of the three membranes or meninges that cover the brain and spinal cord. It extends into the longitudinal fissure, the deep groove that separates the two cerebral hemispheres.

The Part of the Dura That Extends into the Longitudinal