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Questions and Answers
What is the origin of the vertebro-basilar system?
Which of the following areas is supplied by the posterior inferior cerebellar artery (PICA)?
What is the result of occlusion of the posterior inferior cerebellar artery?
What does the anterior spinal artery supply?
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Where does the basilar artery terminate?
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Which artery descends along the posterior roots of the spinal nerves?
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What is the function of the medullary branches of the vertebral artery?
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Which of the following arteries is not part of the vertebro-basilar system?
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Study Notes
Arterial Supply of the Brain
- Brain blood supply comes from two systems: Vertebro-basilar system and Internal carotid system.
Vertebro-basilar System
- Arises from the 1st part of the subclavian artery at the root of the neck.
- Ascends through the foramina transversaria of cervical vertebrae, exiting at the atlas vertebra.
- Enters the foramen magnum and runs medially along the medulla oblongata.
- Forms the basilar artery at the lower border of the pons.
- Branches:
- Anterior spinal artery: descends along the spinal cord's anterior median fissure, supplying the anterior 2/3 of its cross-sectional area, as well as the medulla oblongata's medial part.
- Posterior spinal artery: descends along the spinal nerve's posterior roots, supplying the posterior 1/3 of the spinal cord's cross-sectional area.
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Posterior inferior cerebellar artery (PICA):
- Largest branch of the vertebral artery.
- Travels backward below the medulla's olive, reaching the cerebellum's inferior surface.
- Supplies:
- The posterior part of the cerebellum's inferior surface, including the inferior vermis.
- The inferior cerebellar peduncle.
- The 4th ventricle's choroid plexus.
- Medulla oblongata's lateral part.
- Occlusion leads to lateral medullary syndrome ("PICA syndrome" or "Wallenberg's syndrome").
- The posterior spinal artery may originate from it.
- Medullary branches: Throughout its course.
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Description
Explore the critical structures involved in the arterial supply of the brain, focusing on the Vertebro-basilar and Internal carotid systems. This quiz will help you understand the origins, pathways, and branches of arteries that supply the brain and spinal cord, enhancing your knowledge of neuroanatomy.
