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Questions and Answers
What is the primary function of the Circle of Willis?
What is the primary function of the Circle of Willis?
- To provide collateral circulation between arteries (correct)
- To supply blood to the cerebrum
- To regulate blood pressure in the brain
- To connect the internal carotid arteries to the vertebral arteries
Which artery supplies the posterior 1/3 of the cerebrum?
Which artery supplies the posterior 1/3 of the cerebrum?
- Anterior cerebral artery
- Middle cerebral artery
- Internal carotid artery
- Vertebral artery (correct)
What is the origin of the internal carotid artery?
What is the origin of the internal carotid artery?
- Bifurcation of common carotid artery (correct)
- Anterior cerebral artery
- Subclavian artery
- Vertebral artery
Which of the following is NOT a branch of the vertebral artery?
Which of the following is NOT a branch of the vertebral artery?
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What structure do the internal carotid arteries pass through before entering the cranial cavity?
What structure do the internal carotid arteries pass through before entering the cranial cavity?
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Which of the following arteries is NOT a part of the Circle of Willis?
Which of the following arteries is NOT a part of the Circle of Willis?
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Study Notes
Internal Carotid Artery
- Origin: bifurcation of common carotid artery
- Course: passes through carotid canal in temporal bone, then enters cranial cavity
- Branches:
- Anterior cerebral artery
- Middle cerebral artery
- Posterior communicating artery
- Supplies:
- Anterior 2/3 of cerebrum
- Basal ganglia
- Internal capsule
Circle of Willis
- A ring-shaped anastomotic structure at the base of the brain
- Formed by:
- Anterior communicating artery
- Anterior cerebral arteries
- Posterior communicating arteries
- Posterior cerebral arteries
- Internal carotid arteries
- Functions:
- Provides collateral circulation between arteries
- Ensures constant blood flow to the brain
- Allows for equalization of blood pressure between arteries
Vertebral Artery
- Origin: subclavian artery
- Course: passes through transverse foramina of cervical vertebrae (C6-C1), then enters cranial cavity
- Branches:
- Posterior inferior cerebellar artery
- Anterior spinal artery
- Posterior spinal artery
- Supplies:
- Posterior 1/3 of cerebrum
- Cerebellum
- Brainstem
- Spinal cord
Cerebral Arteries
- Internal carotid artery originates from bifurcation of common carotid artery
- It passes through carotid canal in temporal bone, then enters cranial cavity
- Branches into anterior cerebral artery, middle cerebral artery, and posterior communicating artery
- Supplies anterior 2/3 of cerebrum, basal ganglia, and internal capsule
Circle of Willis
- A ring-shaped anastomotic structure at the base of the brain
- Formed by anterior communicating artery, anterior cerebral arteries, posterior communicating arteries, posterior cerebral arteries, and internal carotid arteries
- Provides collateral circulation between arteries, ensuring constant blood flow to the brain
- Allows for equalization of blood pressure between arteries
Vertebral Artery
- Originates from subclavian artery
- Passes through transverse foramina of cervical vertebrae (C6-C1), then enters cranial cavity
- Branches into posterior inferior cerebellar artery, anterior spinal artery, and posterior spinal artery
- Supplies posterior 1/3 of cerebrum, cerebellum, brainstem, and spinal cord
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Description
Learn about the internal carotid artery, its origin, course, branches, and supplies. Also, explore the circle of willis, an anastomotic structure at the base of the brain.
