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Medial occipitotemporal gyrus

The medial occipitotemporal gyrus, commonly referred to as part of the fusiform gyrus, is a key structure located on the inferior surface of the temporal and occipital lobes of the human brain. It plays a critical role in visual processing, especially in the recognition of faces, objects, and written words. Bordered by the collateral sulcus laterally and the lingual gyrus medially, this gyrus is integral to higher-order visual perception and certain aspects of memory. Understanding its anatomy, vascular supply, function, and radiological appearance is essential for clinicians, radiologists, and neuroscientists.

Synonyms

  • Fusiform gyrus (particularly its medial aspect)

  • Medial fusiform gyrus

  • Gyrus occipitotemporalis medialis (Latin)

  • Occipitotemporal medial gyrus

Arterial Supply

  • Primarily supplied by branches of the posterior cerebral artery (PCA)

    • Posterior temporal branches

    • Occipital branches of the PCA

  • Occasionally receives collateral flow from the middle cerebral artery (MCA)

Venous Drainage

  • Drained mainly via the inferior cerebral veins

  • Ultimately empties into the transverse sinus through the vein of Labbé or directly into the straight sinus via the basal vein of Rosenthal

Function

  • Visual object and face recognition (part of the ventral visual pathway)

  • Word and letter recognition (important in reading)

  • Processing of complex visual stimuli (colors, shapes, and categories)

  • Integration of visual memory and perception

MRI Appearance

  • T1-Weighted Images:
    Appears isointense to slightly hypointense compared to surrounding cortical white matter; sulci and gyri are well-differentiated.

  • T2-Weighted Images:
    Cortex appears hyperintense relative to white matter, with clear delineation of the gyrus and adjacent structures.

  • FLAIR (Fluid Attenuated Inversion Recovery):
    Gray matter of the gyrus demonstrates intermediate signal; FLAIR helps to suppress CSF signal in adjacent collateral and occipitotemporal sulci, enhancing visualization of cortical lesions or pathology.

CT Appearance

  • Appears as a cortical ribbon of similar density to the surrounding gray matter

  • Well-defined from underlying white matter due to subtle differences in attenuation

  • May be visualized indirectly by its position between the collateral and occipitotemporal sulci on the inferior temporal surface

MRI images

Medial occipitotemporal gyrus mri 3t sagittal image

CT image

Medial occipitotemporal gyrus CT sag anatomy image -img-00001-00001