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18 Cards in this Set
- Front
- Back
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Anastomosis
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A point of connection between 2 blood supply routes
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Collateral supply
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Blood suppplied to an underperfused area by an alternate or 2ndary route
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Arterial endzone
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The most distal part of an arterial supply; may or may not have collateral supply via anastomoses
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Extracranial vessels
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Aka CERVICAL:
-Carotids -Vertebrals |
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Arterial components just distal to Extracranial vessels:
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Pre-cortical arteries
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What are the Precortical Arteries?
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-MCA
-ACA -PCA -Basilar |
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From what do the Precortical arteries arise?
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Intracranial Branching of Carotid/Vertebral arteries
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Arterial components just distal to Precortical vessels:
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Precortical Perforating arterioles
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Why are they called perforating arteries?
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B/c they penetrate into the Brainstem, Thalamus, and Basal Ganglia
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What vessels are distal to Precortical perforating arterioles?
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Surface arteries and arterioles
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What are the 6 levels of arterial components, biggest to smallest?
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1. Extracranial Vessels
2. Large precortical arteries 3. Precortical perforating aa. 4. Surface aa and arterioles 5. Cortical perforating arterioles 6. Capillaries |
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What are the precortical perforating arteries?
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The ones that penetrate the brain before the feeding arteries actually get to the cortex.
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What are the feeding arteries that get to the cortex?
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Surface arteries and arterioles
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What are the general features of surface arteries/arterioles?
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-Much smaller than Precortical;
-Repeated branching and anastomoses w/ neighbor vessels |
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What are the Cortical perforating arterioles?
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The ones that penetrate the brain tissue AFTER the feeding arteries went through cortex.
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How are the cortical perforating arterioles oriented?
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Perpendicular to the brain surface
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What is the feature of the deepest branches of the cortical perforating arterioles?
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They have very little collateral supply.
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Which vessels have smooth muscle sphincters?
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-Surface arterioles
-Cortical perforating arterioles |
