What is actually happening when our brain tells us we need to go pee?
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Your bladder is full. This triggers nerves that let you know your bladder is full and you need to do something about it.
Your bladder is kinda like an elastic balloon. When it fills up it starts to stretch it downwards due to the gravity of the liquid, which pulls on the nerves that are attached to the outside of the bladder. This nerves then fire a signal that travels to a specific part of the brain stem called PMC, which starts and governs the involuntary process of urination – of course we know that urination is not involuntary for us but we have a conscious control over it, which means that PMC’s reaction has to be inhibited by some other structure in the brain, preferably one located in frontal cortex(where the conscious though originate, at least in the most accepted paradigm), we just are not sure which one… the leading hypothesis suggests that it’s some part of the medial prefrontal cortex, but scientists are not sure yet.
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