Class Notes (836,802)
Canada (509,909)
Psychology (7,783)
PSYB65H3 (519)
Ted Petit (310)
Lecture 3

Lecture 3 Notes

4 Pages
Unlock Document

Ted Petit

Human Brain and Behaviour Lecture 3 ➢ Mid-term: Friday, Nov 4 from 3 – 5pm ➢ Vascular Disorders  Things that go wrong with blood supply  Cerebro-Vascular Accident (CVA) – Stroke  Asevere interruption of blood supply to the brain  Brain does not stay alive for very long without blood supply and glucose (within minutes)  Get to the hospital instantly  Fast  Aschemia  Adisruption in blood supply (blockage)  Ageneral insufficient supply of blood  Whenever this happens, death of the brain tissue  When severe – causes an infarct = which means dead or dying tissue  This blockage of blood flow can be very fast, immediate (more common) or even slow  Most of the damage is irreversable  However, blockage of blood supply can happen over time – especially during old age due to cholesterol, etc.  What happens during stroke depends on which artery is blocked and also the larger the artery the more massive the damage is going to be. • Entire cerebral artery damage = damage to the frontal lobes  Encepholomalacia  Avery slow reduction in the brain supply which causes an accumulation of small amounts of damage rather than stroke which is sudden and quite dramatic  Bruised tissue, some cells are dying and some are not  Softening of brain tissue – tends to occur more in the elderly  Always slow  Transient-AschemicAttack  Temporary  You get aschemia (not enough blood supply) but it's temporary.  People have migraine headaches may sometimes get this. They usually get a loss of vision in a particular part of their visual field.  Caused by the musculature on the outside of the blood vessels contracting – reducing blood supply to the brain – temporary since migraines do go away. Reduction is not enough to kill neurons but it doesn't allow them to work very well, causing part of visual field to disappear.  Migraines are caused by pain in the blood vessels, not pain in your head.  These attacks can be caused by migraines but what causes sudden blockage/obstruction? • 1)Thrombosis • Alocally formed blockage in the artery which can be caused by blood clots. • But blood clots can dissolve quite quickly • 2) Embolism • Something is going on in another part of the body – cholesterol forming somewhere else but breaks away and then ends up getting to the brain and blocking it. • 3)Arterio-sclerosis • Slow blockage due to cholesterol – in the elderly  Cerebral Hemmhorage • Ablood vessel inside the brain that bursts – internal bleeding • Can be found in younger people but mostly in the elderly • If it's small and causes death in an area – it's still referred to as a stroke • Bleeding inside the brain  Subdoral Hematoma • Bleeding in the space between the skull and the brain • NOT bleeding inside the brain • CSF all gets squeezed to one side • The bleeding puts pressure on the brain • But since its not inside the brain, you won't have any damage to the brain – you can drain it out. But if you let it go and allow it to get to the brain stem, it may result in brain damage/death. • As we mature, the blood vessels get a little more fragile  Angioma • Acollection or a mass of enlarged abnormal blood vessels • Happens before you're born • Blood vessels didn't form properly – abnormal • By themselves are not serious – but they interfere with blood supply sometimes • They are inherently weak – not strong as regular blood vessels • They often just burst on their own • You may live with these vessels for your whole life and be fine but they could burst at anytime  Aneurism • An expansion of a weakened part of a blood vessel • Vascular Dialation caused by problems in the elasticity of the blood vessel. • Having a weak spot in blood vessel. • If aneurism bursts inside brain its a cerebral hemmhorage and if it burts outside then it would be a subdoral hema
More Less

Related notes for PSYB65H3

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.