Which arteries supply the anterior two-thirds of the cerebral hemispheres and some deeper brain structures?

• A. Internal Carotid Arteries
• B. External Carotid Arteries
• C. Vertebral Arteries
• D. Basilar Artery

Answer: (A)

Blood to the front two-thirds of the cerebrum comes from the internal carotid arteries. They enter the skull and split into the anterior cerebral and middle cerebral arteries, which perfuse the medial and lateral surfaces of the hemispheres and extend blood supply into some deep structures, such as parts of the basal ganglia and internal capsule through perforating branches. The external carotid arteries mainly supply the face and scalp, not brain tissue. The vertebral arteries and the basilar artery belong to the posterior circulation, supplying the brainstem and posterior regions rather than the anterior two-thirds. So the internal carotid arteries are the source that supplies this region.