The collateral sulcus runs along the underside of the temporal and occipital lobes, separating the parahippocampal and lingual gyri medially from the fusiform gyrus laterally. It is deep enough to produce a bulge, the collateral eminence, in the floor of the lateral ventricle's temporal and occipital horns. Its front part continues as the rhinal sulcus.
| Location | Inferior surface of the temporal and occipital lobes, between the parahippocampal and lingual gyri medially and the fusiform gyrus laterally |
|---|---|
| Parts |
|
| Connections | |
| Blood Supply | Posterior cerebral artery |
Separates the medial limbic and visual gyri from the fusiform gyrus on the underside of the hemisphere.
The collateral sulcus is a landmark on MRI for measuring the entorhinal and perirhinal cortex in memory disorders. The perirhinal cortex in its banks is affected early in Alzheimer disease. Variations in its depth make volume measurements here technically demanding.
Early atrophy of the entorhinal and perirhinal cortex along the collateral sulcus.
Scarring of the hippocampus and nearby cortex, often studied with reference to this sulcus in epilepsy.
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