Four septa Cerebral falx大脑镰 Tentorium of cerebellun小脑幕- in front there is a gap,the tentorial incisure幕切迹, for passage of midbrain Cerebellar faⅸx小脑镰 Diaphragma sellae鞍隔Four septa ◼ Cerebral falx 大脑镰 ◼ Tentorium of cerebellum小脑幕－in front there is a gap, the tentorial incisure 幕切迹, for passage of midbrain ◼ Cerebellar falx 小脑镰 ◼ Diaphragma sellae 鞍隔