This is a diagram of the peripheral nervous system. As you can see, nerves exit from between the vertebrae and travel to all parts of the body. When these nerves become pressed or compromised, it can have affects in the corresponding areas.
By placing the cursor on the vertebrae, you can see what areas of the body are most commonly affected when the vertebra becomes subluxated or out of its proper alignment.
It is important to remember that for proper function of all parts of the body, the spine must be free from subluxation. When poor function in any area of the body exists the spine must be examined for subluxation.