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Topic

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Parietooccipital sulcus

The parietooccipital sulcus is a prominent and deep groove on the medial surface of the cerebral hemisphere, acting as a key anatomical landmark that separates the parietal lobe from the occipital lobe. It is crucial in neuroanatomical orientation and is well-visualized on neuroimaging, playing an important role in radiological interpretation of brain topography.

Synonyms

  • Parieto-occipital fissure

  • Sulcus parietooccipitalis

Function

  • Serves as an anatomical landmark distinguishing the parietal lobe from the occipital lobe

  • Aids in orientation during neurosurgical procedures and in radiological brain mapping

  • No direct neurological function, but essential for defining adjacent cortical regions

Arterial Supply

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

  • Additional minor contributions from the parietooccipital artery, a branch of the PCA

Venous Drainage

  • Drained mainly by the parietooccipital vein

  • Parietooccipital vein drains into the superior sagittal sinus and occasionally the straight sinus

MRI Appearance

  • T1-weighted MRI:

    • Appears as a hypointense (dark) linear groove separating the parietal and occipital lobes

    • Surrounded by isointense cortical gray matter and underlying white matter

  • T2-weighted MRI:

    • Appears as a hyperintense (bright) cerebrospinal fluid (CSF)-filled sulcus

    • Borders formed by hypointense cortical and subcortical structures

  • FLAIR MRI:

    • Sulcus is hypointense (dark) due to CSF suppression

    • Stands out between cortical and subcortical brain tissue

CT Appearance

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

  • Well-delineated in cases of brain atrophy or when the sulcus is prominent

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MRI images

Parietooccipital sulcus MRI 3T axial image

MRI images

Parietooccipital sulcus MRI 3T sagittal image