Anatomical Presentation Of The Occipitotemporal Sulcus Of The Brain

Description

Occipitotemporal sulcus courses anteroposterior along the inferior (basal) surface of the cerebral hemisphere, forming an elongated cleft between the lateral margin of the fusiform gyrus (gyrus occipitotemporalis medialis) medially and the inferior temporal gyrus laterally. Posteriorly it approaches the occipital pole and calcarine territory, while anteriorly it extends toward the ventral temporal lobe, remaining inferior to the lateral occipital and temporal convexity. Medial to the fusiform gyrus, the collateral sulcus typically runs in parallel, helping orient the ventral surface by bracketing the fusiform between two longitudinal grooves. Ventral temporal landmarks matter because they map directly onto the ventral visual processing stream and common lesion patterns. Infarction in the posterior cerebral artery distribution, traumatic contusion of the inferior temporal surface, or mass effect from a tentorial meningioma can distort this sulcal corridor and the adjacent fusiform cortex, a region linked to face and word-form recognition deficits such as prosopagnosia or pure alexia when injured. The fixed basal perspective clarifies how the occipitotemporal sulcus aligns with neighboring gyri that are often hard to separate in oblique clinical images, and it provides a reliable reference when correlating cortical surface anatomy with axial and coronal MRI. Neuroanatomy instructors can pair this illustration with ventral-surface dissection labs to test identification of sulci and gyri beyond the Sylvian and central sulci. It also suits neurosurgical and neuroradiology publications discussing inferior temporal approaches, epilepsy workups involving ventral temporal electrodes, and clinicopathologic correlation for PCA-territory strokes. Anatomical accuracy verified by SciePro's Medical Advisory Board.