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Frontobasal artery

The frontobasal artery is a small cortical branch of the anterior cerebral artery (ACA) that supplies the basal (inferior) surface of the frontal lobe. It plays an important role in perfusion of the orbitofrontal and medial frontal regions, which are involved in behavior, executive function, and olfaction.

Although small, the frontobasal artery has significant clinical relevance in anterior cerebral artery strokes, aneurysmal subarachnoid hemorrhage, frontal lobe infarction, and interpretation of cortical vascular territories on neuroimaging.

Synonyms

  • Medial orbitofrontal artery

  • Frontobasal branch of the anterior cerebral artery

Location

  • Arises from the A2 segment of the anterior cerebral artery

  • Courses anteriorly and inferiorly along the basal surface of the frontal lobe

  • Runs near the gyrus rectus and medial orbital gyrus

  • Situated above the cribriform plate and anterior cranial fossa

  • Medial to the olfactory tract and bulb

  • Supplies the inferomedial frontal lobe

Anatomical components

  • Cortical arterial branch:

    • Small-caliber vessel

    • Variable origin and branching pattern

  • Pial artery:

    • Runs in the subarachnoid space

    • Gives short cortical perforators to adjacent cortex

  • Territorial variability:

    • May overlap with orbitofrontal or frontopolar artery territories

Relations

Inferiorly:

  • Anterior cranial fossa floor

  • Cribriform plate of the ethmoid bone

Superiorly:

  • Medial frontal cortex

Medially:

  • Falx cerebri

  • Pericallosal artery (nearby but separate)

Laterally:

  • Orbital surface of the frontal lobe

  • Olfactory tract and bulb

Posteriorly:

  • Gyrus rectus

Vascular territory (structures supplied)

  • Gyrus rectus

  • Medial orbital gyrus

  • Inferomedial frontal cortex

  • Parts of the orbitofrontal cortex

  • Adjacent subcortical white matter

Function

  • Cortical perfusion: Supplies regions involved in decision-making, behavior, and emotional regulation

  • Olfactory association support: Contributes to perfusion near olfactory cortex

  • Frontal lobe integration: Supports executive and personality-related cortical functions

MRI appearance

MRI T1-weighted appearance

  • On routine (non-angiographic) T1:

    • Lumen shows flow void → low signal (dark) linear / punctate structures along the orbitofrontal surface

    • Surrounded by intermediate-signal brain parenchyma and high-signal fat in nearby orbits/skull base

MRI T2-weighted appearance

  • Normal fast-flowing blood produces flow void:

    • Frontobasal arteries appear as thin dark (signal-void) lines or dots on the basal frontal surface

    • Surrounding CSF in basal cisterns is bright, making the dark vessel more conspicuous

MRI FLAIR appearance

  • Similar to T2 for normal vessels:

    • CSF is suppressed (dark), but arteries still show flow void (dark)

    • Frontobasal arteries are seen as small dark linear/punctate structures against the orbitofrontal cortex

CT (post-contrast) appearance

  • With iodinated contrast (or CTA):

    • Frontobasal arteries show strong homogeneous opacification, appearing as thin enhancing vessels coursing along the basal frontal surface

    • Best appreciated on CTA/MIP/3D reconstructions, where they are seen as small branches from ACA (medial) and MCA (lateral) supplying the orbitofrontal region

MRI images

MRI Fronto_basal (orbitofrontal) artery axial anatomy image -img-00000-00000

MRI images

MRI Fronto_basal (orbitofrontal) artery coronal anatomy image -img-00000-00000

MRI images

MRI Fronto_basal (orbitofrontal) artery sagittal anatomy image -img-00000-00000