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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.
Additional images
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Coronal section through posterior cornua of lateral ventricle. (Collateral fissure labeled at bottom center.) -
Human brain dissection video (62 sec). Demonstrating location of collateral sulcus.
References
This article incorporates text in the public domain from page 820 of the 20th edition of Gray's Anatomy (1918)
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