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The vertebral and basilar arteries supply blood to several structures in the brain including: the occipital cortex, the brainstem consisting of the midbrain, pons and medulla, the cerebellum and the thalamus. Atherosclerosis or hardening of the arteries is the primary cause of vertebrobasilar disease. The narrowing of the vertebral or basilar arteries caused by atherosclerosis creates vertebrobasilar insufficiency (VBI), or an insufficient delivery of blood flow to the posterior structures of the brain.
The anterior or the posterior circumflex humeral artery, both of which are branches of the axillary artery. The anterior and posterior circumflex humeral arteries anastomose and supply blood to the surgical neck of the humerus and the deltoid, the coracobrachialis, and the heads of the biceps muscles.