cerebral circulation by human physiology

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PRESENTEDBY: DR ZAINAB IQBAL
UNITEDCOLLEGE OF PHYSICAL THERAPY
KARACHI

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 CEREBRAL CIRCULATION
BLOOD VESSELS OF CEREBRAL
CIRCULATION
CEREBRAL BLOOD FLOW
CHARACTERISTICS OF CEREBRAL
CIRCULATION
BLOOD BRAIN BARRIER

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5.  The movement of blood through the network
of blood vessels to supply the brain.
 The arteries carries oxygenated blood and
other nutrients to the brain
 The veins carry deoxygenated blood back to
the heart removing carbondioxide and
metabolic products.
 .
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6.  Two internal carotid arteries
 Two vertebral arteries form
 (basilar artery)
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7.  THESE ALL ARTRIES UNITE TOGETHER TO
FORM CIRCLE OF WILLI FROM WHICH SIX
CEREBRAL ARTRIES ARISES TO SUPPLY THE
BRAIN.
 THE CIRCLE OF WILLI IS A CIRCULATORY
ANASTOMOSIS THAT SUPPLIES BLOOD TO THE
BRAIN AND SURROUNDING STRUCTURES.
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8.  THESE ALL ARTRIES UNITE TOGETHER
TO FORM CIRCLE OF WILLI FROM
WHICH SIX CEREBRAL ARTRIES ARISES
TO SUPPLY THE BRAIN.
 THE CIRCLE OF WILLI IS A CIRCULATORY
ANASTOMOSIS THAT SUPPLIES BLOOD
TO THE BRAIN AND SURROUNDING
STRUCTURES.
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9.  NORMAL VALUE
 IN ADULT CBF IS 750ML/PM
 AND 50% OF THE CRDIAC OUTPUT
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The movement of blood in cerebral
circulation is called cerebral blood
flow.

10. 1.CEREBRAL CIRCULATION
 enclosed in solid skull
 Brain tissue blood and CSF volumes remain
same at any time
2.GLUCOSE:
 IT IS MAJOR SOURCE IN BRAIN
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11. 3.BRAIN
 Loss of conciousness if hypoxia is more than
5 sec.
 Tissue damages if hypoxia is more than 3
min.
HYPOGLYCEMIIA: Condition caused by a very
low level of blood sugar.
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12.  BLOOD BRAIN BARRIER IS AN IMPORTANT
CONDUCT OF NUTRITIENTS AND CELLS FROM
THE BLOOD TO THE BRAIN
 IT IS A SEMIPERMEABLE MEMBRANE
SEPARATINGTHE BLOOD FROM THE CSF .
 IT IS A BARRIER TO PASSAGE OF CELLS PARTICLES,
AND LARGE MOLECULES.
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13.  It protects the brain from endogenous
and exogenous
 It maintains the local environment of the
neuron in CSF constant
 Preventing the escape of local
neurotransmitters into general circulation
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FUNCTION

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