We use muscles for everything that we physically do. When we move any of our body parts in any way whatsoever, muscles are involved in accomplishing that motion.

Indeed, we couldn’t imagine our daily lives without the 600+ muscles in different parts of our body that facilitate a myriad of physical motions and actions.

However, you might be surprised to know that fingers, which are involved in almost all movements of the hands, don’t contain muscles to facilitate movement!

So… how do we extend, flex or curl our fingers if there are no muscles there in the first place?[…]

Source: How Do Fingers Work If They Don’t Contain Muscles?