A Cross-Section of the Skull Featuring the Anterior Cerebral Artery

Description

Sectioned cranial vault and anterior facial skeleton frame the intracranial contents, with the nasal cavity and maxillary dentition visible inferiorly and the anterior cranial fossa forming the superior boundary of the cutaway. From the circle of Willis at the base of the brain, the anterior cerebral artery (ACA) courses anteromedially over the optic chiasm region, then turns superiorly within the interhemispheric fissure to run along the superior surface of the corpus callosum as the pericallosal artery, accompanied by the callosomarginal branch along the cingulate sulcus. More laterally, the middle cerebral arteries diverge into the sylvian fissures, while the posterior cerebral arteries sweep posteriorly around the midbrain. Orientation is clear. Understanding the ACA’s midline trajectory matters because its A1 and A2 segments, the anterior communicating artery, and the pericallosal branches define the hemodynamic crossroads where saccular aneurysms commonly arise and rupture into the subarachnoid space. This view also clarifies why ACA territory infarcts preferentially affect the medial frontal and parietal lobes, often presenting with contralateral leg-predominant weakness and behavioral or executive changes, a pattern that differs from middle cerebral artery syndromes. For neurosurgical and endovascular planning, the relationship of the ACA to the corpus callosum and cingulate gyrus provides a clean map for interhemispheric approaches and for anticipating distal embolic distribution. Neuroanatomy and cerebrovascular teaching sessions can use this cutaway to anchor the circle of Willis, segment the ACA into A1 through A5, and relate named branches to cortical territories in a single plate. Stroke chapters, aneurysm reviews, and patient education materials for anterior communicating artery aneurysm can also draw on the straightforward spatial layout of vessels within the skull. Anatomical accuracy verified by SciePro's Medical Advisory Board.