What accurately describes the anatomy of the vertebral artery?

Correct answer is А. Тhe vertebral artery arises from the subclavian artery and ascends through the transverse foramina of the cervical vertebrae, contributing to the posterior circulation of the brain. It merges with the contralateral vertebral artery to form the basilar artery. B) Incorrect. The vertebral artery does not originate from the external carotid artery; it arises from the subclavian artery. C) Incorrect. The vertebral artery does not directly branch from the aorta; its origin is from the subclaviаn artery. D) Incorrect. The vertebral artery does not arise from the internal carotid artery; it originates from the subclavian artery.