Brain's Preoccipital Notch, Inferior View

Description

Preoccipital notch marks the inferolateral margin where the temporal lobe meets the occipital lobe. From an inferior perspective, the indentation sits along the ventral border of the cerebral hemisphere, lateral to the tentorial surface, with the posterior inferior temporal region lying anterior to it and the inferior occipital surface extending posteriorly toward the occipital pole. Nearby ventral landmarks that typically frame this territory include the fusiform (occipitotemporal) gyrus, the inferior temporal gyrus laterally, and the parahippocampal gyrus and uncus more medially on the basal temporal surface. A small notch, a reliable guide. Clinically, the preoccipital notch helps you define the temporal-occipital boundary when describing lesions on the ventral cerebrum, where sulcal patterns alone can be inconsistent between individuals. That matters in presurgical planning for posterior temporal lobe epilepsy, in selecting a temporo-occipital craniotomy corridor that respects the tentorium and avoids disorientation on the basal surface, and in radiology reporting when correlating inferior temporal and inferior occipital findings with posterior cerebral artery territory infarction, venous sinus disease, or mass effect along the tentorial edge. The fixed inferior lighting and emphasis on the ventral border make the notch easy to localize relative to adjacent gyri without distracting dorsal convexity anatomy. Neuroanatomy faculty can drop this illustration into basal surface teaching for lobe boundaries, while neuroradiology and neurosurgery publications can use it as a figure to standardize terminology when describing ventral temporo-occipital lesions, approaches, or electrode coverage on the inferior temporal and fusiform gyri. Anatomical accuracy verified by SciePro's Medical Advisory Board.