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Occipitotemporal sulcus

The occipitotemporal sulcus is a prominent anatomical groove located on the inferior surface of the temporal and occipital lobes of the human brain. It runs longitudinally, separating the fusiform gyrus (medially) from the inferior temporal gyrus (laterally). This sulcus plays a key role in defining the boundaries of adjacent gyri and is important for various higher-order visual processing tasks. The structure is visible on neuroimaging studies and serves as a reliable landmark for radiologists and neurosurgeons.

Synonyms

  • Lateral occipitotemporal sulcus

  • Sulcus occipitotemporalis (Latin)

  • Inferior temporal sulcus (less common, may refer to a slightly different structure)

Function

  • Anatomical landmark separating fusiform gyrus and inferior temporal gyrus

  • Associated with visual recognition, particularly complex object and face processing due to proximity to fusiform gyrus

  • Involved in the integration of visual information from the occipital to temporal regions

Arterial Supply

  • Primarily supplied by branches of the posterior cerebral artery (PCA), particularly the temporo-occipital branches

  • Some contribution from the middle cerebral artery (MCA), especially for more anterior portions

Venous Drainage

  • Drains into the inferior anastomotic vein (vein of Labbé)

  • Also drains into the superior sagittal sinus via superficial cortical veins

MRI Appearance

  • T1-weighted images:

    • The occipitotemporal sulcus appears as a hypointense (dark) linear structure separating adjacent gyri; filled with cerebrospinal fluid (CSF).

  • T2-weighted images:

    • The sulcus appears hyperintense (bright) due to CSF signal, sharply delineating the fusiform and inferior temporal gyri.

  • FLAIR images:

    • The sulcus appears as a hypointense (dark) line since FLAIR suppresses CSF signal, providing clear anatomical detail against the surrounding parenchyma.

CT Appearance

  • Appears as a linear hypodensity (dark line) corresponding to the CSF-filled sulcus on non-contrast CT

  • Delineation may be subtle but is often visible in axial sections of the inferior temporal and occipital regions

MRI images

Occipitotemporal sulcus MRI 3T axial image

MRI images

Occipitotemporal sulcus MRI 3T sagittal image