I am not sure we positively know every single detail there is to know about neurons, but we know an excruciating amount of details. At the level of a single ne

I am not sure we positively know every single detail there is to know about neurons, but we know an excruciating amount of details. At the level of a single neuron, it's physiology and connections to neighbouring neurons, we know everything we need to know that it has absolutely nothing to do with QM. There are no mysterious phenomena here, nothing outside biochemistry and physiology.