How You Know Where Your Arms Are

You can put on a jacket without watching your hand all the time. You know where your arm is, even when you cannot see it. How?

Your muscles, the parts of your body that help you move, have sensors. These are very small parts that feel changes. They feel when your muscles get longer or pull.

They send messages to your brain, the part inside your head that helps you think and move. Your brain uses these messages and information from your eyes and the things you touch. Together, they help you know where your body parts are.

These messages also help you move. A bag may be heavier than you think. Your body gets this information and can work harder to lift it. You do not have to think about every change.

Practice helps, too. You can learn to use your hands without always watching them. Your eyes are still important, but you do not need to watch every move.