Topics

Topic

design image
Occipital pole

The occipital pole is the most posterior portion of the occipital lobe of the brain, forming the rounded end of the occipital cortex. It plays a central role in processing visual information and serves as a key anatomical landmark in neuroimaging and neurosurgery. Located deep to the inion and covered by the occipital bone, the occipital pole is easily identified on both MRI and CT scans due to its position at the back of the cerebral hemispheres.

Synonyms

  • Posterior pole of the occipital lobe

  • Occipital extremity

  • Occipital apex

Arterial Supply

  • Primary supply: Posterior cerebral artery (PCA), especially its calcarine and parieto-occipital branches

  • Minor contributions: Middle cerebral artery (MCA) via its occipital branches (occasionally), and anterior cerebral artery (ACA) (rarely)

  • Clinical note: Watershed zones may exist between the PCA and MCA in this region

Venous Drainage

  • Superficial venous drainage: Drains primarily via the superior sagittal sinus and transverse sinus

  • Deep venous drainage: Deep occipital veins may drain towards the internal cerebral veins

  • Notable veins: Occipital vein, superior sagittal sinus, transverse sinus

Function

  • Primary visual processing: Contains the primary visual cortex (Brodmann area 17)

  • Visual perception: Responsible for basic processing of visual stimuli such as light, shape, and movement

  • Visual field representation: Maps the contralateral visual field

  • Clinical significance: Lesions here can cause visual field deficits such as contralateral homonymous hemianopia

MRI Appearance

  • T1-weighted images:

    • Gray matter appears intermediate to low signal

    • White matter appears higher signal than gray

    • Good anatomical differentiation between cortical and subcortical structures

  • T2-weighted images:

    • Gray matter appears hyperintense (bright)

    • White matter appears relatively hypointense (darker than gray)

    • Sulci and gyri are well visualized

  • FLAIR images:

    • Gray matter is hyperintense compared to white matter

    • CSF signal is suppressed, improving detection of subtle lesions (such as demyelination or infarcts)

    • Occipital pole cortex clearly distinguished from adjacent structures

CT Appearance

  • Non-contrast CT:

    • Gray matter appears slightly denser than white matter

    • Occipital pole easily identified as the posterior rounded cortex adjacent to the occipital bone

    • Normal pole should have symmetrical density

    • Acute infarcts may appear as hypodense (darker) areas

    • Hemorrhages or masses are hyperdense (brighter) compared to normal tissue

MRI images

occipital pole mri 3t axial image

MRI images

occipital pole mri 3t sagittal image

CT image

Occipital pole CT sag anatomy image -img-00001-00001