1 Calcarin's fissure: extends from the occipital of the cerebrum to the occipital fissure. 2  Callosomarginal fissure: found in the mesial surface of the cerebrum. 3  Central sulcus or Rolando's fissure: separates the brain's frontal and parietal lobes. Medial longitudinal fissure or Longitudinal fissure: which divides the cerebrum into the two hemispheres. 2  Fissure of Bichat: found below the corpus callosum in the cerebellum of the brain. 3  Broca's fissure: found in the third left frontal fold of the brain.