Collateral Sulcus, Medial View

Description

Collateral sulcus (sulcus collateralis) dominates the medial perspective on the inferior surface of the cerebral hemisphere, carving a deep longitudinal furrow along the ventromedial temporal lobe and extending toward the occipital pole. Medial to the sulcus, the parahippocampal gyrus forms a broad strip that continues posteriorly toward the lingual gyrus, while lateral to it the fusiform (occipitotemporal) gyrus occupies the ventral temporal surface. Posteriorly, the sulcal pattern approaches the medial occipital landmarks, and the collateral sulcus runs inferior to the region where the calcarine sulcus and cuneus define the primary visual cortex on the medial wall. Depth is the story here. For neuroanatomy teaching, this fixed medial-inferior viewpoint helps anchor sulci and gyri that are frequently confused on cross-sectional imaging, because the collateral sulcus is a consistent divider between the parahippocampal cortex and the ventral temporal (fusiform) cortex implicated in high-level visual processing. In clinical practice, neuroradiologists use the collateral sulcus as a surface correlate for the collateral eminence bulging into the floor of the temporal horn, a relationship that becomes relevant when evaluating mesial temporal sclerosis, temporal horn dilatation, or planning trajectories that avoid the hippocampal formation during epilepsy surgery. The lighting and shading emphasize sulcal depth and gyral curvature, supporting quick orientation without relying on labels. Use this illustration in medical neuroanatomy courses, radiology correlation lectures (MRI of the medial temporal lobe), and neurosurgical teaching materials covering mesial temporal resections and inferior temporal approaches where surface landmarks guide safe corridor planning. It also fits well in textbooks and review articles discussing ventromedial temporal lobe anatomy, parahippocampal region localization, and sulcal variability across individuals. Anatomical accuracy verified by SciePro's Medical Advisory Board.