Berry Aneurysms | Circle of Willis | Blood supply of Brain скачать в хорошем качестве

Berry Aneurysms | Circle of Willis | Blood supply of Brain

The circle of Willis, or the circulus arteriosus, is formed by the anastomosis of the two internal carotid arteries with the two vertebral arteries. The anterior communicating, anterior cerebral, internal carotid, posterior communicating, posterior cerebral, and basilar arteries are all part of the circle of Willis. Saccular, or berry, aneurysms account for more than 80% of all intracranial aneurysms; they are outpouchings of cerebral arteries that probably form over a relatively short period of time (days to weeks). The most likely site of these berry aneurysms is at the junctions of arteries in the circle of Willis. Rupture of the aneurysm results in arterial bleeding into the cerebrospinal fluid (subarachnoid hemorrhage), which produces an acute, excruciating headache, nausea, vomiting, signs of meningeal irritation, and sometimes loss of consciousness. A sudden subarachnoid hemorrhage may be immediately fatal. Autopsy studies show that most cerebral aneurysms never rupture. Untreated ruptured aneurysms have approximately a one third likelihood of rebleeding within 2 months, sometimes with fatal results; other sequelae are cerebral infarction and vasospasm of the affected vessel. Treatment sometimes involves clipping the aneurysm or occluding it with coils or balloons. Join us now for Personalized Medical Education https://www.medcampus.io/ Download medCampus app Android: https://play.google.com/store/apps/de... iOS: https://apps.apple.com/us/app/medcamp...