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Subparietal sulcus

The subparietal sulcus is a prominent anatomical groove located on the medial surface of the cerebral hemisphere within the parietal lobe. It serves as a critical landmark separating the precuneus (anteriorly) from the posterior part of the cingulate gyrus (posteriorly). This sulcus is oriented in a roughly anteroposterior direction, lying parallel and just dorsal to the splenium of the corpus callosum. Due to its deep location and proximity to the cingulate sulcus and parieto-occipital sulcus, the subparietal sulcus is best appreciated on medial brain imaging. It plays a role in identifying the boundaries between important cortical regions during both anatomical dissection and neuroimaging.

Synonyms

  • Sulcus subparietalis (Latin)

  • Medial parietal sulcus

Function

  • Acts as an anatomical boundary between the precuneus (superiorly) and the posterior cingulate gyrus (inferiorly).

  • Serves as an important landmark for neurosurgeons and neuroradiologists in identifying adjacent cortical regions.

  • Indirectly involved in the demarcation of brain areas associated with visuospatial processing and memory, through its bordering gyri.

Arterial Supply

  • Primarily supplied by the pericallosal branches of the anterior cerebral artery (ACA), especially the distal segments.

  • Additional supply from branches of the posterior cerebral artery (PCA), particularly in its posterior portions.

  • Regional vascularization may vary among individuals due to anatomical variation in cerebral arteries.

Venous Drainage

  • Drained via the superior sagittal sinus through the superficial cortical veins.

  • Medial parietal veins may drain directly into the superior sagittal sinus or via bridging veins.

MRI Appearance

  • T1-weighted images:

    • Appears as a linear hypointense (dark) groove separating the precuneus from the posterior cingulate gyrus.

    • Clearly delineated in sagittal and medial coronal planes.

  • T2-weighted images:

    • Appears as a linear hyperintense (bright) sulcus due to CSF signal, surrounded by intermediate signal intensity of adjacent cortical gray matter.

    • Enhanced contrast between sulcus and surrounding cortex.

  • FLAIR images:

    • Normal subparietal sulcus appears hypointense (dark) because the FLAIR sequence suppresses the signal from CSF.

CT Appearance

  • Appears as a linear hypodensity (dark line) on non-contrast CT, representing the CSF-filled space of the sulcus.

  • Best visualized on midline sagittal or coronal reformatted images.

MRI images

Subparietal sulcus MRI 3T axial image

MRI images

Subparietal sulcus MRI 3T sagittal image