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The only real function of the fubula, the small long bone in the leg, is a site for muscle attachments. It does not provide any real support for the body.
The ulna is located beside the radius and connects the elbow to the hand. If you hold out the palms of your hands, the ulna is located on the right side of your left arm and on the left side of your right arm. A trick to telling them apart is that the ulna is the one "in line" with your pinky finger; the radius "in line" with your thumb