Structural Morphology Of The Inferior Temporal Sulcus Of The Brain

Description

Inferior temporal sulcus (sulcus temporalis inferior) forms a prominent longitudinal cleft on the ventrolateral surface of the temporal lobe, separating the inferior temporal gyrus superiorly from the lateral aspect of the fusiform gyrus (gyrus occipitotemporalis lateralis) inferiorly. The groove runs roughly anteroposterior, parallel to the inferior temporal gyrus above and the collateral sulcus more medially, with cortical banks that highlight the transition from lateral temporal association cortex toward ventral occipitotemporal cortex. Along its posterior extent, the sulcus approaches the occipital-temporal junction where gyral patterns become more variable. Depth and shadowing emphasize the sulcal fundus. Sulcal morphology in this region matters because the inferior temporal sulcus serves as a practical surface landmark for orienting the ventral visual processing stream and the fusiform cortex during teaching, functional mapping, and operative planning. Variants in sulcal continuity can shift how the fusiform gyrus is partitioned, which becomes relevant when correlating surface anatomy with fMRI activation related to face and object recognition and when describing lesion location in radiology reports. In anterior temporal lobectomy or selective approaches for temporal lobe epilepsy, you often need stable gyral and sulcal references to communicate margins on the inferolateral temporal surface without relying solely on deep landmarks. Neuroanatomy and neuropsychology courses can pair this illustration with discussions of ventral occipitotemporal function and sulcal variability, while neurosurgery and neuroradiology publications can use it to standardize language around inferior temporal and fusiform gyral boundaries in tumor, infarct, or contusion localization. Anatomical accuracy verified by SciePro's Medical Advisory Board.