Callosal-marginal groove

The callosal-marginal groove (lat. sulcus callosomarginalis; synonym: lateral groove, lateral groove, sulcus lateralis, sulcus marginalis) is a groove in the middle part of the cerebral hemisphere, located at the junction of the parietal and temporal lobes.

The callosal-marginal groove begins at the anterior edge of the aqueduct of Sylvius, passes through the corpus callosum and ends at the superior edge of the temporal lobe. It divides the lateral surface of the hemisphere into superior and inferior surfaces.

In adults, the callosal-marginal groove is absent, but in children it can be pronounced.

Callosal-marginal grooves are usually absent in patients with epilepsy.