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Topic 8: Grey matter - Coggle Diagram

- - - - Tumour cells respond differently to a magnetic field than healthy cells as they show up as a lighter colour on MRI scans. The scan will show a tumour's exact size and location. Doctors can then decide what brain functions have been affected
  - - - like MRI, the imaging is high quality, but it can also be used to investigate brain function if a function is carried out whilst the patient is in the scanner
        
        fMRI scans show damaged and diseased areas of the brain and allows us to study conditions caused by abnormal activity in the brain such as scanning a patients brain before and during a seizure to identify the malfunctioning parts of the brain.
  - - - A CT can show major structures of the brain, but not the functions of said structures. Hence it can show a diseased and damaged brain structure and whether or not the patient has lost some function. What that function specifically is, however, cannot be identified
        
        Because blood has a different density to brain tissue, it shows up as a lighter colour on a CT scan. From there, you can find what blood vessels have been damaged, the extent of the bleeding, and what brain functions may have been affected by the bleeding
  - - - It gives detailed images of the brain and gives the functions of the brain in real time.
        
        It can show unusually active or inactive sites of the brain and are useful for studying disorders that change the brains activity
- - - - This means that less dopamine (a neurotransmitter) travels across the synaptic clefts
        
        so less dopamine is available to bind to receptors on the postsynaptic membrane
        
        hence less sodium ions diffuse across the postsynaptic membrane and chances of depolarisation occuring and an action potential happening would decrease massively
        
        this leads to symptoms such as tremors and slow movement