neuronal

Once inside the brain, ethanol’s unique structure allows it to bind to, interact, and affect many different neuronal receptors, impairing pathways that allow you to make careful decisions, control your impulses, and even manage your motor skills.

And that is sometimes true in the brain and there are hardwired connections in the brain and they're myelinated, which is basically a way of insulating kind of the neuronal connections for faster information transmission.