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What percentage of blood flow to the head and neck is supplied by the vertebral arteries?

10%

20%

The correct answer indicates that the vertebral arteries supply approximately 20% of the blood flow to the head and neck. The vertebral arteries are paired vessels that branch off from the subclavian arteries and ascend through the cervical vertebrae to merge and form the basilar artery at the level of the brainstem. These arteries primarily supply blood to the posterior part of the brain, including the cerebellum and brainstem.

This percentage is significant when considering the overall blood flow dynamics to the head and neck, as it highlights the critical role of the vertebral arteries in maintaining adequate cerebral perfusion. Understanding the contributions of various arterial sources to cerebral blood flow is essential for comprehending the vascular anatomy and its clinical implications, such as in cases of stroke or other cerebrovascular disorders.

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