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
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