The Atlas is the first bone in the spine, located at the base of the skull. It supports the head and is the passageway for the arteries that provide up to 40% of the blood supply to the brain. It also protects the spinal cord that connects the brain with the rest of the body.
A good non-medical example of the atlas is a major traffic light at a 4-way intersection. When the traffic light works properly, traffic flows smoothly. However, when that light (the atlas) is not working right, traffic backs up and there are problems not just at the intersection but in all directions behind the 4-way intersection.
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