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| posterior cerebral artery | |
|---|---|
| Name | Posterior cerebral artery |
| Latin | Arteria cerebri posterior |
| System | Circulatory system |
| Partof | Circle of Willis |
posterior cerebral artery The posterior cerebral artery is a major cerebral artery arising from the basilar or the posterior communicating artery and supplying the occipital lobe, inferior temporal lobe, thalamus, and midbrain. It is anatomically linked to the Circle of Willis and functionally important for visual processing, memory circuits, and thalamic relay nuclei. Lesions affecting the vessel produce characteristic visual field deficits, thalamic syndromes, and cortical signs that have been described in classical neurological literature.
The artery arises from the terminal bifurcation of the basilar artery or, in fetal configurations, from the internal carotid artery via the posterior communicating artery. It is classically divided into P1 (precommunicating), P2 (postcommunicating), P3 (quadrigeminal), and distal segments that course around the cerebral peduncle and calcarine fissure to supply the occipital lobe, inferior temporal gyrus, and medial occipito-temporal regions implicated in visual recognition tasks studied in Broca-related language models and in clinical series from centers such as Mayo Clinic and Johns Hopkins Hospital. Branches include perforators to the thalamus, choroidal branches to the lateral ventricle, and cortical branches to the calcarine cortex; these relationships are illustrated in atlases from the Royal College of Surgeons and described in operative texts from Harvard Medical School and the University of Oxford.
Embryologically, posterior cerebral artery origins reflect the transient prominence of the fetal internal carotid artery; when the fetal pattern persists, the PCA arises from the internal carotid via the posterior communicating artery, a variant recorded in classic embryology by investigators at Cambridge University and in teratology studies affiliated with Columbia University. The maturation of the posterior circulation involves remodeling of the vertebrobasilar system and regression of primitive carotid-basilar anastomoses, processes explored in developmental series at UCLA and historical monographs from Johns Hopkins University.
The PCA supplies the primary visual cortex within the calcarine sulcus, inferior occipital regions for visual association, inferior temporal cortex implicated in object recognition, and medial temporal structures including the hippocampal formation as delineated in neuroanatomical maps used at Massachusetts General Hospital and Stanford University School of Medicine. Deep perforating branches perfuse the thalamus and midbrain nuclei involved in oculomotor control and arousal, regions often examined in clinical case reports published in journals from The Lancet and New England Journal of Medicine.
Common variants include a fetal-origin PCA with dominant supply from the internal carotid artery, asymmetric fetal patterns noted in vascular surveys from Cleveland Clinic, and hypoplastic segments described in population cohorts at Karolinska Institutet and National Institutes of Health. Collateral pathways involve the Circle of Willis connections to the anterior and middle cerebral circulations and leptomeningeal anastomoses with branches of the middle cerebral artery documented during angiographic studies at Mayo Clinic and in stroke registries coordinated by World Health Organization collaborations.
Occlusion of the PCA leads to contralateral homonymous hemianopia with macular sparing, alexia without agraphia in dominant hemisphere infarcts, and thalamic syndromes producing sensory loss or memory impairment noted in landmark reports from Guy's Hospital and case series from Massachusetts General Hospital. PCA territory hemorrhage or ischemia can produce midbrain syndromes with oculomotor palsy described in surgical literature from University of Pennsylvania and emergency neurology series from Mount Sinai Health System. Chronic atherosclerotic disease and embolic phenomena involving the PCA are frequent entries in multicenter trials led by investigators at Oxford University and University of Cambridge.
Evaluation employs computed tomography angiography performed at centers like Johns Hopkins Hospital and magnetic resonance angiography protocols standardized by consortia including American Heart Association and European Stroke Organisation. Digital subtraction angiography remains the gold standard in interventional series from Cleveland Clinic and Mayo Clinic, while diffusion-weighted MRI sequences from Beth Israel Deaconess Medical Center detect acute infarction in PCA territories. Perfusion imaging and functional MRI mapping of visual cortex are utilized in preoperative planning at Stanford University School of Medicine and neuroimaging cores at Harvard Medical School.
Acute ischemic PCA stroke follows reperfusion strategies aligned with guidelines from the American Heart Association and thrombolysis and mechanical thrombectomy protocols refined in trials at Royal Melbourne Hospital and Massachusetts General Hospital. Secondary prevention involves antithrombotic therapy and risk-factor modification as per recommendations from European Society of Cardiology and stroke prevention programs at Johns Hopkins Hospital. Neurosurgical or endovascular management of PCA aneurysms and vascular malformations is performed in specialized centers including Mayo Clinic and Cleveland Clinic with techniques described in textbooks from Oxford University Press.
Category:Cerebral arteries