Cerebral vascular supply
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CEREBRAL VASCULAR SUPPLY. General Information. Brain receives 20% of the cardiac output. Major arterial supply via: Internal carotids: Give off paired anterior cerebral arteries. Give off paired middle cerebral arteries. Vertebral arteries: Join to form unpaired basilar artery.

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General information l.jpg
General Information

  • Brain receives 20% of the cardiac output.

  • Major arterial supply via:

    Internal carotids:

    Give off paired anterior cerebral arteries.

    Give off paired middle cerebral arteries.

    Vertebral arteries:

    Join to form unpaired basilar artery


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Posterior Inferior Cerebellar Aa

  • Branches of vertebral arteries.

  • To:

    Dorsolateral part of medulla

    Posterior choroid plexus

    Posterior/inferior parts of cerebellum

  • Form unpaired anterior spinal artery.

  • Form basilar artery.


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Basilar Artery Branches

  • Anterior inferior cerebellar artery

    To upper medulla and pons

  • Internal auditory artery

    To part of inner ear

  • Pontine arteries

    To pons

  • Superior cerebellar artery

  • Terminate as posterior cerebral arteries


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Posterior Cerebral Arteries

  • Terminal branches of basilar artery.

  • To:

    Medial and inferior surfaces of the temporal and occipital lobes, posterior thalamus.


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Posterior Cerebral Arteries

  • Occlusion results in thalamic syndrome:

  • Contralateral diminishing of general somatic modalities in head (ventral posterior nucleus).

  • Threshold for pain, temperature, and tactile sensation on contralateral side of head raised.

  • Mild stimuli may produce disagreeable sensations.


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Middle Cerebral Branches

  • Largest branches of internal carotid arteries.

  • Run between temporal and frontal lobes.

  • To most of lateral surfaces of cerebrum.

  • Give off striate arteries:

    To internal capsule and adjacent structures.

    Stroke:

    Contralateral upper motor-neuron paralysis of face and UE/LE as well as sensory disturbances.


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Anterior Cerebral Arteries

  • Branches of internal carotid arteries.

  • Give off perforating arteries to hypothalamus.

  • Extend rostrally and then curve upwards and backwards around corpus callosum:

    Pericallosal arteries

  • Occlusion:

    Contralateral paresis and diminished sensitivity in LE.


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Circle of Willis

  • Interconnects vertebral and internal carotid supply.

  • Components:

    Posterior cerebral arteries

    Posterior communicating arteries

    Internal carotids

    Anterior cerebral arteries

    Anterior communicating artery


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Watershed Areas

  • Border zones of cerebral arteries.

  • Decreased blood supply.

  • Hypoperfusion may result in:

    Paralysis/sensory loss bilateral UE

    Disturbed vision

    Disturbed memory

    Chorea

    Aphasia


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