How does our hand work?

Hello guys, so we made a hand by using paper, straw, and string. So our fingers contain bones our fingers contain 3 bones and our thumb only has 2 bones, our palm has 5 bones leading to each finger, our bones provide structure and support. The joints in our hands allow us movement between bones, ligaments in our hands are attached to bones together and this can allow us to move certain direction only.   

Our fingers don't contain any muscle the only muscle in our hands is our palm and forearm. Our long tendons run from our tip to our own muscle. Here is my work and hope you like it.