The falx cerebri goes down into the longitudinal fissure, that separates the hemispheres of the brain.
大脑镰向下进入纵裂,将大脑的两个半球分开。
英语百科
Medial longitudinal fissure
The medial longitudinal fissure (or cerebral fissure, or longitudinal fissure, or interhemispheric fissure) is the deep groove that separates the two hemispheres of the vertebrate brain.
The falx cerebri, a dural brain covering, lies within the medial longitudinal fissure.