The research area of posterior circulation refers to the study of the blood supply and circulation to the back part of the brain, specifically the brainstem and cerebellum. This area includes important structures such as the basilar artery, vertebral arteries, and posterior cerebral arteries. Researchers in this area may investigate conditions that affect the posterior circulation, such as stroke, aneurysms, and other vascular abnormalities. Understanding the posterior circulation is crucial for diagnosing and treating various neurological disorders and conditions that may arise in this region of the brain.