The soul is that aspect of ourselves that is indestructible and eternal. The brain is subject to all kinds of diseases and accidents that can impair its functioning. It can be crushed by weapons or destroyed by poisonous chemicals. We could be completely brain-dead yet our soul is still intact.
Our brains enable us to communicate our experiences through language, the manipulation of vocal chords, and muscular movements of the mouth. The soul is more of an experience than it is an object. It is not a thing that lives in a certain part of our brains. If anything, our miraculous brain lives in our soul,, which is something we will never see but can easily experience once we know the path.