collateral fissure collateral fissure the collateral fissure (or sulcus) is on the tentorial surface of the hemisphere and extends from near the occipital pole to within a short distance of the temporal pole. collateral fissuremedial surface of left cerebral hemisphere. (collateral fissure labeled at bottom left.)medial surface of right cerebral hemisphere. collateral sulcus divides limbic (purple) and temporal lobe (green).detailsidentifierslatinsulcus collateralis, fissura collateralisneuronames47ta98a14.1.09.206ta25442fma83751anatomical terms of neuroanatomy behind, it lies below and lateral to the calcarine fissure, from which it is separated by the lingual gyrus; in front, it is situated between the parahippocampal gyrus and the anterior part of the fusiform gyrus. additional images coronal section through posterior cornua of lateral ventricle. (collateral fissure labeled at bottom center.) wikimedia commons has media related to collateral sulcus.