4. Arterial supply to the brain Flashcards Preview

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Flashcards in 4. Arterial supply to the brain Deck (14):
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which arteries supply the following areas?

blue: anterior cerebral artery

yellow: middle cerebral artery

red: posterior cerebral artery

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Name the 2 major arteries that give rise to the anterior and posterior brain circulations

Anterior : ICAs

Posterior : vertebral arteries

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What are the 2 main branches of the ICA? What does each supply?

1. ANTERIOR CEREBRAL ARTERY: most medial portions of frontal and parietal lobes, inc. medial homonculus (lower limbs)

 

2. MIDDLE CEREBRAL ARTERY: maj. of lateral cerebral hemispheres

- lateral frontal + parietal lobes, inc. lateral homonculus (upper limbs and face)

- superior temporal lobes, inc. visual pathways 

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Which arteries supply the basal ganglia? Why is this area of the brain susceptible to stroke?

LENTICULOSTRIATE ARTERIES: branches of middle cerebral artery.

 

Very small calibre so susceptible to emboli. 

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How are the 2 anterior cerebral arteries connected? What is the importance of this?

Via ANTERIOR COMMUNICATING ARTERY. 

 

Forms the CIRCLE OF WILLIS - supplies collateral circulation to anterior brain (though not perfect).

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What do the 2 vertebral arteries give rise to?

Comme through foramen magnus, ascend clivus and merge to form BASILAR ARTERY.

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Which basilar artery branches supply the posterior brain?

POSTERIOR CEREBRAL ARTERIES - supply posterior temporal lobe and occipital lobe (visual function).

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How are the anterior and posterior brain circulations connected?

POSTERIOR COMMUNICATING ARTERIES: from posterior cerebral arteries to ICAs.

12

Describe the blood supply to the cerebellum.

Branches of basilar artery:

1. SUPERIOR CEREBELLAR ARTERIES

2. ANTERIOR INFERIOR CEREBELLAR ARTERIES

3. POSTERIOR INFERIOR CEREBELLAR ARTERIES

13

Describe the blood supply to the brainstem.

1. PONTINE BRANCHES of basilar artery - supply pons

2. Cerebellar arteries have to so round brainstem to reach cerebellum so also supply brainstem. 

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How is the anterior 2/3 of the spinal cord supplied?

Vertebral arteries give off a small branch to form ANTERIOR SPINAL ARTERY