The radius is like the rockstar of your forearm bones, taking center stage when it comes to movement. It's the bone that helps you rotate your arm, so you can do all sorts of cool things like play guitar, throw a ball, or even just give a thumbs up. And fun fact: the radius is also the bone that helps youpronate, or turn your palm downwards - it's like a built-in latte-cup holder!
But don't get too carried away with the radius just yet, because the ulna is also a key player in the forearm bone duo. The ulna is like the behind-the-scenes expert, working tirelessly to help you move your arm and wrist. And let's not forget, the ulna is also home to the funny bone - you know, that spot where you can tap and feel a weird, tingling sensation?
Radius And Ulna What Is The Difference at Edward Gratwick blog