About the human brain, what part of the brain would be fatal?

if a single bullet Like a 32 cal went thru it?

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Answer:
A bullet going through any part of the brain can be and usually is fatal. While the brain is injured directly by the bullet passing through, the more important concern is the blast injury imparted by the bullet. This can cause a huge amount of swelling which can diminish blood flow to the brain and cause brain death if it becomes severe enough. It is possible to survive gunshot wounds to the brain, but most people don't. The other poster is correct that an injury to the brainstem is almost universally fatal.

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Answer:
The brainstem, at the base of your skull. It is the part of the brain that controls breathing, heartbeat, ect. Even if a .22 round went through it, it would be very fatal.