Posterior Cerebral Artery Segments

Basilar artery

Terminal vertebral artery

distal middle proximal

Atlas

Small perforating arteries i ,

Internal Carotid Artery

Figure 1.5 A schematic drawing of the circle of Willis, siphons and intracranial posterior circulation vessels. OA, ophthalmic artery; ICA, internal carotid artery; AcomA, anterior communicating artery; PcomA, posterior communicating artery; A1, A2, segments of the anterior cerebral artery; M1, M2, segments of the posterior cerebral artery; P1, P2, segments of the posterior cerebral artery; VA, vertebral artery.

Terminal

VA's

Figure 1.5 A schematic drawing of the circle of Willis, siphons and intracranial posterior circulation vessels. OA, ophthalmic artery; ICA, internal carotid artery; AcomA, anterior communicating artery; PcomA, posterior communicating artery; A1, A2, segments of the anterior cerebral artery; M1, M2, segments of the posterior cerebral artery; P1, P2, segments of the posterior cerebral artery; VA, vertebral artery.

anterior communicating or posterior communicating arteries (see also Chapter 3). The first branches of the circle of Willis include anterior, middle and posterior cerebral arteries. These arteries have first- and second-degree branches (i.e. Ml and M2 segments of the MCA [11]) that along with the intracranial vertebrobasilar system can be evaluated with cerebrovascular ultrasound through the intact skull [5],

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