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Lecture

note 03


Department
Psychology
Course Code
PSYB65H3
Professor
Ted Petit

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Lec 03
problems in vescular system
brain is a high metabolic tissure, oxygen is very important, lack of oxygen in brain can cause
serious damage
BLOOD SUPPLY PROBLEMS
block of blood flow--
-cerebral vescular accident (CVA): severe interuption to blood supply of brain resulted in ischemia
(not enough oxygen/blood supply, produce dead or dying tissue called infarct)
-encephomalacia: long-term/slow block of artery that causes brain tissue damage (SLOW
reduction of blood supply, tissue become 'softening' but not completely dead)
-transient ischemic attack (TIA): temporally restriction of blood flow (severe headache is
commonly invo lved in), no brain damage
cause of disruption in blood flow--
-thrombosis: locally formed blockage (right there in the brain)
-embolism: blockage that breaks off from somewhere else
-austerious crosis (general clogging of arteries): slow process, associated more with
encephomalacia, usually happens in old people
blood vessel burst--
-cerebral haemorrhage: messive bleeding into the brain tissue itself
-can kill the tissue, threat life (die immediatly)
-usually associated with high blood pressure
subdural hematoma--
-bleeding underneath the dural mater between skull and brain
-not kill brain tissue directly but add pressure on it
-if released the blood and pressure on time, no brain damage will occur
-death will be caused if the pressure runs at the base to the brain stem
angioma--
-collection/mess of enlarged abnormal blood vessels
-patients with high blood pressure are easy to burst blood vessels
anuerysm--
-vescular dilation caused by localized problem of elasticity
-low elastic vessels start to bulge o ut and burst, causing cerebral haemorrhage or other bleeding
-no symptoms, can be treated at early time
CLOSE HEAD INJURY
-blow to the head and cause brain damage but not open up the brain itself
-most common damage at frontal portion of frontal lobe and temporal lobe
-contra coup effect: brain hit a side of skull and re-hit to the other side (double shock)
BRAIN TUMOR
-caused by cancer (a mess of growing tissue that grows independently from other tissue)
-glioma: cancer of glia cells
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