![]() ![]() While there is no universally accepted naming system of the carotid segments, the one by Bouthillier is the most commonly used. The internal carotid artery can be broken down into multiple segments, typically C1-C7 based on a classification system by Bouthillier et al. Segmental hypoplasia or aplasia is common, with a complete circle of Willis observed in less than 20% of the population. There are numerous variations to this classic anatomy, many of which cause an incomplete circle. The circle is completed via connections of the distal ICAs to the PCAs via the posterior communicating arteries, and the bilateral ACAs are connected via the anterior communicating artery. The basilar artery then bifurcates into the bilateral posterior cerebral arteries. The basilar artery gives off distinct branches, including the anterior inferior cerebellar artery (AICA), pontine perforating arteries, and the superior cerebellar arteries. The posterior circulation is supplied by the vertebral arteries, which join to form the basilar artery. The anterior circulation is largely provided by the ICAs, which branch intracranially into the middle cerebral and anterior cerebral arteries. The Circle of Willis is an anastomotic ring of vessels that supply the brain. These extracranial vessels supply the Circle of Willis, named after Thomas Willis, an English physician. ![]() The intracranial arteries are supplied by the vertebral and the bilateral internal carotid arteries. ![]()
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