Good point! Kind of analogous to a computer. A computer isn't "in" the CPU; it's an integrated system of CPU, memory, I/O devices (keyboard, mouse, monitor, speakers), ports, sensors, etc.

The mind is a function of the entire nervous system, not just the brain.

I listen to a lot of Andrew Huberman, and one interesting thing he covers is how neurons don't just exist in the brain, and they aren't exclusively for processing thoughts. Your gut actually has hundreds of millions of neurons, and they signal all sorts of things subconsciously to your mind!