By 'fundamental', I mean a property that is essential to understanding. This is because the property cannot be understood in terms of anything thought to be more basic (or easier to understand) than itself. Motion is a fundamental propety of an object. If we think of an object as to be composed of particles that each of them is incapable of motion, then we only can conceive of an entire object as to be itself incapable of motion too. The only way out of this dungeon is to regard motion as fundamental.
In a similar way, consciousness must be understood as fundamental. If your brain is conscious, then every particle that makes up the brain must be, at that very moment, conscious! Though this conclusion is axiomatic, mainstream scientist try to escape it because it has a very profound implication that can turn all their tables upside down (or infact rightside up)!
Below in the 'comments', I am going to debunk claims that attempt to simplistically treat consciousness as emergent in the brain.