Vertebral artery is a branch of?

NIA - 29 January 2023

Applied Anatomy

Easy

Appeared in: NIA - 29 January 2023

Explanation

The vertebral artery is a major vessel responsible for the posterior circulation of the brain.
Anatomically, it originates as the first branch from the superoposterior aspect of the subclavian artery.
It then ascends through the transverse foramina of the cervical vertebrae before entering the skull.
This direct origin from the subclavian artery is a key anatomical fact.

Option A: The common carotid artery is part of the anterior circulatory system of the head and neck. It bifurcates into the internal and external carotid arteries and does not give rise to the vertebral artery.
Option C: The basilar artery is formed by the convergence (joining) of the right and left vertebral arteries. Therefore, it is a continuation of the vertebral arteries, not their origin.
Option D: The internal carotid artery is a terminal branch of the common carotid artery. It, along with its branches, forms the anterior circulation of the brain (Circle of Willis) and is distinct from the posterior circulation supplied by the vertebral arteries.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the major arteries of the neck and brain, specifically the origin of the vertebral artery as background academic context rather than a clinical decision trigger.
Understanding the origin of the vertebral artery is crucial for diagnosing conditions like vertebrobasilar insufficiency, where reduced blood flow in these arteries can cause dizziness, vertigo, and vision problems.
In Subclavian Steal Syndrome, a blockage in the subclavian artery proximal to the vertebral artery's origin causes blood to flow backward (retrograde) down the vertebral artery to supply the arm, 'stealing' blood from the brain and causing neurological symptoms.
What if a patient presents with dizziness and arm weakness only when using their left arm? This could suggest left-sided Subclavian Steal Syndrome, prompting a nurse to check for a blood pressure difference between the arms and report the findings, as it points to a specific vascular blockage.

How to Approach the Question

This is a factual recall question from anatomy.
First, identify the key structure in the question: the 'Vertebral artery'.
The question asks for its 'branch of', which means you need to identify its parent artery or origin.
Mentally visualize or recall the major arteries branching from the aorta and supplying the head and neck.
Evaluate each option: The subclavian artery gives off several branches in the neck, including the vertebral artery. The carotid arteries form the anterior circulation. The basilar artery is formed by the vertebral arteries.
Based on this anatomical knowledge, select the subclavian artery as the correct origin.

Concept Tested & Keywords

Concept Tested: Anatomy of the major arteries of the neck and brain, specifically the origin of the vertebral artery.
Stem keywords: Vertebral artery, branch of
Lead-in keywords: BEST, MOST RELEVANT CLUE
Negative lead-in flag: false