The ulna ( / ˈ ʌ l n ə /   ) is one of the two long bones in the forearm (the other is the radius ). It is on the side opposite the thumb, extends from the elbow to the wrist , and runs parallel to the radius, which it exceeds in length and size. In anatomical position , when the arms are down at the sides of the body and the palms of the hands face forward, the ulna is located at the side of the forearm closest to the body (the medial side). The bone may break due to excessive weight or impact.
It is very important to control the movement of a broken bone. Moving a broken bone can cause additional damage to the bone, nearby blood vessels, and nerves or other tissues surrounding the bone.
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