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Medical Term:

collateral sulcus


Definition: a long, deep sagittal fissure on the undersurface of the temporal lobe, marking the border between the fusiform gyrus laterally and the hippocampal and lingual gyri medially; the great depth of the collateral sulcus results in a bulging of the floor of the occipital and temporal horn of the lateral ventricle, the collateral eminence.

Synonym(s): occipitotemporal sulcusTA, sulcus collateralisTA, sulcus occipitotemporalisTA, collateral fissure, fissura collateralis

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.