CEREBRAL VASCULAR SUPPLY
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Transcript CEREBRAL VASCULAR SUPPLY
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
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.
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
Posterior Cerebral Arteries
Terminal branches of basilar artery.
To:
Medial and inferior surfaces of the temporal
and occipital lobes, posterior thalamus.
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.
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.
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.
Circle of Willis
Interconnects vertebral and internal carotid
supply.
Components:
Posterior cerebral arteries
Posterior communicating arteries
Internal carotids
Anterior cerebral arteries
Anterior communicating artery
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