Topics

Topic

design image
Inferior occipital gyrus

The inferior occipital gyrus is a distinct convolution located on the ventral surface of the occipital lobe of the human brain. It plays a crucial role in visual processing, particularly in the interpretation of visual stimuli and object recognition. The region is bounded superiorly by the middle occipital gyrus and medially by the occipital pole and the lingual gyrus. Its anatomical positioning and connections are significant for clinical, radiological, and neurosurgical considerations.

Synonyms

  • Gyrus occipitalis inferior

  • Inferior occipital convolution

  • Inferior occipital lobule

Arterial Supply

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

  • Additional minor contributions from the middle cerebral artery (MCA) through its inferior temporal branches

Venous Drainage

  • Drained mainly via the superior sagittal sinus through cortical veins

  • Additional drainage through the transverse sinus via the superficial veins of the occipital lobe

Function

  • Involved in the processing of visual information, especially in the identification and interpretation of objects

  • Plays a role in visual recognition and analysis of form and color

  • Contributes to early stages of the visual processing stream (ventral stream or "what pathway")

MRI Appearance

  • T1-weighted images:

    • Appears as isointense to slightly hypointense relative to the adjacent white matter

    • Normal anatomical gyri and sulci are well delineated

  • T2-weighted images:

    • Appears hyperintense relative to white matter

    • Good delineation of cortical thickness and adjacent sulci

  • FLAIR sequences:

    • Gray matter is mildly hyperintense relative to white matter

    • Enhances detection of abnormal signals, such as edema or gliosis, within the gyrus

CT Appearance

  • Non-contrast CT:

    • Appears as isodense to slightly hypodense compared to white matter

    • Gyri may be difficult to differentiate unless atrophic or affected by pathology

  • Pathological changes (e.g., infarct, tumor):

    • Area may appear hypodense in acute ischemia or hyperdense in cases of hemorrhage

MRI images

Inferior occipital gyrus mri 3t axial image

MRI images

Inferior occipital gyrus mri 3t sagittal image

CT image

Inferior occipital gyrus CT axial anatomy image -img-00001-00001