In one of our recent science lessons, we constructed a model of the human arm to look at the three different joints in it. We made the ball and socket joint found in the shoulder using a table tennis ball, lollipop stick and a plastic cup so that it could rotate. The hinge joint in the elbow was made with a sticker so that it could bend 90 degrees, and the gliding joint found in the wrist was made by attaching the hand to the arm with a paper fastener.
