9 Questions
What are the two feeder pathways into the Circle of Willis?
Internal Carotid Artery and Vertebral Artery
What is the origin of the Vertebral Artery?
Subclavian Artery
What is the branch of the Vertebral Artery that gives off the Posterior Spinal Artery?
Posterior Inferior Cerebellar Artery
What is formed by the fusion of the Vertebral Arteries?
Basilar Artery
What is the branch of the Basilar Artery that gives off the Labyrinthine Artery?
Anterior Inferior Cerebellar Artery
What forms the posterior part of the Circle of Willis?
Basilar Artery
What is the branch of the Internal Carotid Artery that gives off the Anterior Choroidal Artery?
Middle Cerebral Artery
What connects the Anterior Cerebral Arteries?
Anterior Communicating Artery
What is a common site for berry aneurysms?
Anterior Communicating Artery
Study Notes
Circle of Willis
- Two feeder pathways into the Circle of Willis:
- Internal Carotid Artery
- Vertebral Artery
Vertebral Artery
- Supplied by Subclavian Artery
- Runs up through transverse foramina of cervical vertebrae
- Gives off branches:
- Posterior Inferior Cerebellar Artery (PICA)
- Posterior Spinal Artery
- Anterior Spinal Artery
Posterior Inferior Cerebellar Artery (PICA)
- Branch of Vertebral Artery
- Gives off branches:
- Posterior Spinal Artery
Vertebral Artery Fusion
- Vertebral Arteries fuse to form Basilar Artery
- Basilar Artery gives off:
- Anterior Inferior Cerebellar Artery
- Labyrinthine Artery
- Pontine branches
- Superior Cerebellar Artery
Basilar Artery
- Forms posterior part of Circle of Willis
- Gives off:
- Posterior Cerebral Artery (P1 and P2 segments)
Posterior Cerebral Artery
- Forms posterior part of Circle of Willis
- Divided into two segments:
- P1 segment
- P2 segment
Internal Carotid Artery
- Feeds Circle of Willis
- Gives off:
- Ophthalmic Artery
- Middle Cerebral Artery
Middle Cerebral Artery
- Gives off:
- Anterior Choroidal Artery
- Lenticular Striatal Artery
- Internal Capsule and Lenticular Form Nucleus branches
Anterior Cerebral Artery
- Forms part of Circle of Willis
- Divided into two segments:
- A1 segment
- A2 segment
Anterior Communicating Artery
- Connects Anterior Cerebral Arteries
- Exposed and susceptible to berry aneurysms
Circle of Willis
- Two main arteries supply the Circle of Willis: Internal Carotid Artery and Vertebral Artery
Vertebral Artery
- Supplied by Subclavian Artery
- Passes through transverse foramina of cervical vertebrae
- Gives off three branches:
- Posterior Inferior Cerebellar Artery (PICA)
- Posterior Spinal Artery
- Anterior Spinal Artery
Posterior Inferior Cerebellar Artery (PICA)
- Branch of Vertebral Artery
- Gives off a branch:
- Posterior Spinal Artery
Vertebral Artery Fusion
- Two Vertebral Arteries fuse to form Basilar Artery
- Basilar Artery gives off four branches:
- Anterior Inferior Cerebellar Artery
- Labyrinthine Artery
- Pontine branches
- Superior Cerebellar Artery
Basilar Artery
- Forms the posterior part of Circle of Willis
- Gives off two branches:
- Posterior Cerebral Artery (P1 and P2 segments)
Posterior Cerebral Artery
- Forms the posterior part of Circle of Willis
- Divided into two segments:
- P1 segment
- P2 segment
Internal Carotid Artery
- Supplies the Circle of Willis
- Gives off two branches:
- Ophthalmic Artery
- Middle Cerebral Artery
Middle Cerebral Artery
- Gives off three branches:
- Anterior Choroidal Artery
- Lenticular Striatal Artery
- Internal Capsule and Lenticular Form Nucleus branches
Anterior Cerebral Artery
- Forms part of Circle of Willis
- Divided into two segments:
- A1 segment
- A2 segment
Anterior Communicating Artery
- Connects Anterior Cerebral Arteries
- Susceptible to berry aneurysms
Test your knowledge of the Circle of Willis, including its feeder pathways, branches, and related arteries. This quiz covers the anatomy of the Circle of Willis, Vertebral Artery, and their connections.
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