Drigo

There are these two fibers that I keep reading about but essentially they look the same to me but with the corona radiata being in a lower area of the brain. Could somebody explain the differences between these white matter fibers and why the different names?? Thanks,

So whats the difference between biochemical assays and histological ones. I am reading a paper and this is what the sentences says: "...the degree of dementia correlates much better with Abeta assayed biochemically than with histologically determined plaque counts" So histologically means counting the plaques...but then what will the biochemical assay give me?