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By decision, I meant anything that was more than mere chemical or mechanical reaction. Another way of separating it is the point where we can say there is a purpose or difference between dead molecules and being alive. In this case, going to the cinema is wayyy too advanced a decision to help define. More like a cell or group of cells that recognizes its environment and has the opportunity to decide to go towards one direction over another rather than respond merely because a chemical in their environment reacted with their body in a way that gave them an impulse.
But in the larger picture, it seems like there are many decisions that occur for us to commit a behavior. For example, we have to decide what we perceive, decide what our emotional state is, decide what our memories are, decide our personal taste for movies, decide our current motivational state, decide if we have enough time, etc, be fore we decide to go to the movies. All those have to happen prior to deciding on the cinema, and the majority of them occur simultaneously with a central network organizing them into a coherent process, correct? Omg, is this central network what people call executive functioning‽
I'm afraid you are not going to find anything in the brain except "dead molecules". There isn't anything in there except the laws of physics and chemistry acting out like clockwork.
But in terms of the scale of how "decisions" work. Then, yes, far simpler decisions (perhaps better to say "reactions") happen with relatively few neurons. The complete brains of small insects have been mapped by researchers, maybe several million neurons. They can detect movement reactions happening in response to stimuli.
This though is a very different thing to what people mean when referring to their conscious decision to do something.