=====Collateral sulcus=====
{{ http://upload.wikimedia.org/wikipedia/commons/thumb/1/16/Gray727_collateral_fissure.svg/1025px-Gray727_collateral_fissure.svg.png?400}}

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.

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]].