6 Questions
What is the primary function of the Circle of Willis?
To provide collateral circulation between arteries
Which artery supplies the posterior 1/3 of the cerebrum?
Vertebral artery
What is the origin of the internal carotid artery?
Bifurcation of common carotid artery
Which of the following is NOT a branch of the vertebral artery?
Middle cerebral artery
What structure do the internal carotid arteries pass through before entering the cranial cavity?
Carotid canal in temporal bone
Which of the following arteries is NOT a part of the Circle of Willis?
Vertebral artery
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
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.
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