The anterior cerebral artery (ACA) is a major blood vessel that supplies oxygenated blood to the frontal and parietal lobes of the brain. It branches off from the internal carotid artery and runs along the medial surface of the cerebral hemispheres. The ACA is crucial for functions such as movement, reasoning, and emotional regulation. In addition to the frontal and parietal lobes, the ACA also supplies blood to parts of the corpus callosum and the basal ganglia. Blockage or damage to the ACA can lead to specific neurological deficits, including weakness in the legs and changes in behavior or personality.