Circle of Willis and Saccular Aneurysm

by Craig Canby, PhD

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    Now, I want you to understand the arterial supply to the brain. Here, we see the inferior view of the brain. These are the frontal lobes. Here is the temporal lobe. The occipital lobe is here, for example. Here is our arterial circulation. It's very elaborate and also very important. The arterial supply to the brain is going to be via internal carotid arteries which we see here. The other is unlabelled over here as well as vertebral arteries. One is labelled here. Since these are paired, here’s the one on the opposite side. Now, this particular slide is identifying the connections that exist between your internal carotid arteries and your vertebral arteries. There is a very important circle that forms as a result of how these vessels connect to one another. This is the circle of Willis. So, we’re going to explore the circle of Willis. We’re also going to explore the various branches of the arterial supply to the brain. They’re all shown here in this particular image. Our circle of Willis, if we start there is shown in through here. We have our internal carotids here and here. Inferior in the image here on the lower part your screen, we have our vertebral arteries that we've mentioned before. So, they’re coming in through the foramen magnum. Just below here and out of view of the actual image which would be a branch coming off of each vertebral artery. This particular branch would be your posterior inferior cerebellar artery. It goes by the acronym of PICA. The vertebral arteries then continue joined together and form a very prominent structure called the basilar artery. Shortly, after the basilar artery forms, you’ll give rise to the anterior inferior cerebellar artery. So, here’s the one on this side of the image...

    About the Lecture

    The lecture Circle of Willis and Saccular Aneurysm by Craig Canby, PhD is from the course Cerebral Cortex. It contains the following chapters:

    • Circle of Willis
    • Saccular Aneurysms

    Included Quiz Questions

    1. Posterior inferior cerebellar artery
    2. Anterior inferior cerebellar artery
    3. Paramedian pontine branches
    4. Posterior cerebral artery
    5. Superior cerebellar artery
    1. Posterior cerebral arteries
    2. Paramedian pontine branches
    3. Anterior spinal artery and posterior cerebellar artery
    4. Posterior communicating and posterior cerebral arteries
    5. Anterior and posterior inferior cerebellar arteries
    1. Junction of anterior cerebral and anterior communicating artery
    2. Junction of posterior cerebral and superior cerebellar artery
    3. Junction of posterior cerebral and posterior communicating artery
    4. Basilar artery bifurcation
    5. Bifurcation of middle cerebral artery
    1. Subarachnoid hemorrhage
    2. Germinal matrix hemorrhage
    3. Subdural hematoma
    4. Epidural hematoma
    5. Intracranial bleed

    Author of lecture Circle of Willis and Saccular Aneurysm

     Craig Canby, PhD

    Craig Canby, PhD

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