As the basilar artery moves toward the arterial circle, it branches to supply which two areas?

• A. Frontal lobe and occipital lobe
• B. Hindbrain and cerebellum
• C. Hindbrain and posterior cerebrum
• D. Spinal cord and brainstem

Answer: (C)

The correct response highlights the role of the basilar artery as it approaches the arterial circle, also known as the circle of Willis. As the basilar artery ascends, it primarily supplies vital structures within the hindbrain and posterior cerebrum.

The basilar artery is formed by the union of the two vertebral arteries and travels along the ventral aspect of the brainstem. It gives rise to several branches, including the posterior inferior cerebellar arteries, anterior inferior cerebellar arteries, and the superior cerebellar arteries, which supply the hindbrain structures such as the pons and cerebellum. Following these branches, the basilar artery culminates into the posterior cerebral arteries, which provide blood flow to the posterior aspects of the cerebral hemispheres, notably the occipital lobe and parts of the temporal lobe associated with the posterior cerebrum.

This intricate supply is crucial for maintaining the functionality of areas involved in critical processes such as vision and equilibrium, thereby underlining the importance of the basilar artery's branches in supporting both the hindbrain and the regions of the posterior cerebrum.