Cerebral fissure 

Brain: Medial longitudinal fissure
Great longitudinal fissure visible running left to right.
Latin fissura cerebri longitudinalis
Gray's subject #189 818
NeuroNames hier-16

The great longitudinal fissure (or longitudinal cerebral fissure, or longitudinal fissure, or interhemispheric fissure) is the deep groove which separates the two hemispheres of the vertebrate brain.

The falx cerebri, a dural brain covering, lies within the medial longitudinal fissure.

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