The elbow joint is a hinge joint largely between the humerus and ulna bones, but the radius is involved too. The radius also moves around the ulna, which isn't really an elbow thing but is still up in the elbow region. Have a look at the bony anatomy, the movements here and the ligaments that hold this joint together and help it all work.
Music by Jahzzar
Album: HiFi City Tales
Song: Bodies
https://soundcloud.com/jahzzar
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