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Medial frontobasal artery

The medial frontobasal artery is a small but significant perforating branch of the anterior cerebral artery, responsible for supplying blood to the medial and basal regions of the frontal lobe. This vessel is crucial for the vascularization of the basal surface of the frontal lobe, particularly the medial orbital gyrus and the adjacent gyrus rectus. Understanding its anatomy is important, especially in neurosurgery and neuroradiology, due to its proximity to the anterior communicating artery complex and its involvement in vascular pathologies or surgical procedures in the region.

Synonyms:

  • Medial orbitofrontal artery

  • Internal frontobasal artery

  • Arteria frontobasalis medialis

Origin and Course:

  • Origin: The medial frontobasal artery typically arises from the A2 segment of the anterior cerebral artery (ACA), just distal to the anterior communicating artery.

  • Course:

    • It courses anteriorly and inferiorly along the medial part of the orbital surface of the frontal lobe.

    • The artery runs parallel to the gyrus rectus and supplies the medial orbital gyrus and medial portions of the frontal lobe.

    • It may anastomose with lateral frontobasal branches and other small perforating arteries in the region.

    • Variability exists, and in some individuals, multiple small arteries may substitute for a single defined medial frontobasal artery.

Function (Vascular Territory):

  • Supplies blood to:

    • Medial part of the orbital surface of the frontal lobe

    • Gyrus rectus

    • Parolfactory area

    • Occasionally, part of the olfactory bulb and tract

  • Supports higher cognitive functions, olfaction, and basal frontal lobe function by maintaining perfusion in these regions.

MRI Appearance:

  • Normal MRI:

    • The artery itself is not typically visualized on conventional MRI sequences due to its small caliber.

    • On high-resolution 3D Time-of-Flight (TOF) MR angiography, it may be seen as a fine vessel arising from the A2 segment.

    • Its territory is best inferred from perfusion imaging or in cases of infarction/ischemia, which show restricted diffusion or signal changes in the supplied frontal lobe regions.

CT Appearance:

  • Normal CT:

    • The medial frontobasal artery is not visible on non-contrast CT due to its small size.

    • On CT angiography (CTA), it may be faintly visualized as a delicate branch from the A2 segment.

    • Infarction in its territory may present as low-attenuation changes in the medial orbital frontal lobe.

Clinical Relevance:

  • Infarction or injury to this artery during aneurysm surgery or trauma can lead to cognitive or behavioral changes.

  • Involvement in anterior communicating artery aneurysm surgery may risk damaging this artery, leading to basal frontal lobe infarcts.

MRI images

Medial frontobasal artery mri 3t sagittal image

CT images

Medial frontobasal artery CT axial anatomy image -img-00001-00001

MRI image

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