FISSURE By N., Pam M.S. - May 11, 2013 the name that is given to a groove, cleft or indentation that appears in a surface, in particular the cerebral cortex that increases the brains surface area. See sulcus. FISSURE: "A fissure increases brain area." Related Psychology Terms RHINAL FISSURE PRECUNEUS CALCARINE FISSURE CALCARINE AREA SULCUS THALAMUS CALLOSAL SULCUS ROLANDIC CORTEX CALCARINE FISSURE CORTICAL LAYERS Cite this page: N., Pam M.S., "FISSURE," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/fissure/ (accessed April 5, 2020).