The right vertebral artery arises from which major artery?

• A. Left subclavian artery
• B. Right common carotid artery
• C. R subclavian artery
• D. Internal carotid artery

Answer: (C)

The right vertebral artery arises from the right subclavian artery, which is the source of blood supply for the vertebral arteries on both sides of the body. The right subclavian artery branches off from the brachiocephalic trunk, which is a larger artery that supplies blood to the right arm and the head.

In anatomical terms, the vertebral arteries are crucial for supplying blood to the posterior part of the brain, including the cerebellum and brainstem. Since the vertebral arteries typically arise from the subclavian arteries, the correct connection is between the right vertebral artery and the right subclavian artery.

The other listed arteries do not give rise to the vertebral artery. For instance, the left subclavian artery gives rise to the left vertebral artery instead, while the common carotid arteries primarily supply the anterior circulation of the brain. The internal carotid artery branches into arteries that serve the front and middle parts of the brain, not the vertebral arteries which are critical for posterior circulation. Thus, the right vertebral artery's origin from the right subclavian artery is a clear and accurate representation of its anatomical pathway.