Blood supply of Brain | Circle of Willis Explained | Neuroanatomy

Dive into the intricacies of the blood supply to the brain in this detailed lecture. This video covers the essential pathways and structures, including the Circle of Willis, a critical arterial structure ensuring collateral circulation in the brain.

Key Topics Covered:
Major arteries supplying the brain
Components and function of the Circle of Willis
Clinical significance of the Circle of Willis in stroke and aneurysm prevention
How the brain receives oxygen and nutrients
This lecture is designed for medical students, healthcare professionals, and anyone curious about neuroanatomy. Perfect for understanding one of the most vital networks in the human body.

Stay tuned for clear visuals, simplified explanations, and clinical relevance!

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brain blood supply, circle of willis, arteries of the brain, neuroanatomy, stroke, aneurysm, medical students, Novice Medic, MBBS lecture, neurology basics, medical education, healthcare professionals
arterial supply to the brain, which is also referred to as the circle of willis. We are looking at this diagram in an inferior view and branch out from the internal carotid feeding the anterior portion of the brain, and the vertebrobasilar system which is supplying the posterior portion of the brain. Finally, we look at each artery that forms the circle of willis including the anterior cerebral artery, the anterior communicating artery, the middle cerebral artery, the posterior cerebral artery, and the posterior communicating artery.
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The internal carotid arteries supply the brain with about 80% of its blood, while the vertebral arteries contribute the remaining 20%.

After ascending to the brain, the internal carotid arteries split into the anterior and middle cerebral arteries. The anterior cerebral arteries supply the medial frontal and parietal lobes, and they are connected by the anterior communicating artery. The middle cerebral arteries supply most of the lateral surface of the cerebral hemispheres.

Before splitting into the middle and anterior cerebral arteries, the internal carotids give rise to the anterior choroidal arteries, which supply a number of different structures, and the posterior communicating arteries, which connect the internal carotid arteries to the posterior cerebral arteries.

The vertebral arteries give rise to the posterior inferior cerebellar arteries, which supply the inferior surface of the cerebellum and in most brains will also give rise to the posterior spinal arteries, which supply the posterior spinal cord. The anterior spinal artery, which supplies the anterior spinal cord, also branches off the vertebral arteries, then the two vertebral arteries come together to form the basilar artery. The basilar artery gives rise to the anterior inferior and superior cerebellar arteries, which supply the rest of the cerebellar surface. Then, at the the level of the midbrain, the basilar artery splits into two posterior cerebral arteries. The posterior cerebral arteries supply the medial and inferior surfaces of the occipital and temporal lobes.

The anterior cerebral, internal carotid, and posterior cerebral arteries of both sides of the brain are all connected, forming what is known as the Circle of Willis. This interconnection can allow blood flow to continue if a major vessel is blocked on one side of the brain.
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The branches of basilar and internal carotid arteries anastomose at the base of brain around the interpeduncular fossa forming a six-sided polygon of arteries called circulus arteriosus or circle of Willis. The circle of Willis lies in the interpeduncular subarachnoid cistern and contributes most of the arterial blood supply to the brain.
The circle of Willis is formed:
Anteriorly, by the anterior communicating and the anterior cerebral arteries.
Posteriorly, by the basilar artery dividing into two posterior cerebral arteries.
Laterally on each side, by the posterior communicating artery connecting the internal carotid artery with the posterior cerebral artery.
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Видео Blood supply of Brain | Circle of Willis Explained | Neuroanatomy канала Novice Medic
Circle of Willis Circulation, Blood supply to the brain, Circulus Arteriosus, Cerebral Arterial Circle, brain blood supply, circle of willis, arteries of the brain, neuroanatomy, stroke, aneurysm, medical students, Novice Medic, MBBS lecture, neurology basics, medical education, healthcare professionals, Anatomy - Brain (Circle of Willis and Stroke)