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