Which artery perfuses the frontal lobe (superior and medial aspects including primary motor cortex for leg and urinary bladder), the parietal lobe (anterior aspects including primary somatosensory cortex for leg and foot), and the corpus callosum?

• A. Anterior Cerebral Artery
• B. Middle Cerebral Artery
• C. Posterior Cerebral Artery
• D. Basilar Artery

Answer: (A)

The region described is supplied by the anterior cerebral artery territory. This artery travels along the interhemispheric fissure and gives rise to callosal and pericallosal branches that reach the medial surfaces of the frontal and parietal lobes. The primary motor cortex for the leg and the corresponding primary somatosensory cortex lie on the medial aspect of the hemispheres, so these areas are perfused by branches of the anterior cerebral artery. The corpus callosum, which connects the two hemispheres, is also nourished by its pericallosal branches. In contrast, the middle cerebral artery mainly perfuses the lateral surfaces (face and arm areas), the posterior cerebral artery covers the occipital and inferomedial temporal lobes, and the basilar artery primarily feeds the brainstem and cerebellum.