The neck is a vital and complex region of your body that supports your head and allows your brain to communicate with the rest of your body. Located in the small sub-occipital muscles between your head and upper neck is a dense concentration of little sensors that tell your brain where your head and body are in space. This spatial information is integrated with the sensory information coming from your eyes and ears and allows you to stand upright on two feet and move around your environment without falling down.