Radius and ulna are the bones of the forearm and extend from a person's elbow to his wrist.
- Radius and ulna are the long bones of the body along with the femur, tibia, fibula, and humerus.
- Radius s thicker and shorter than the ulna.
- In the anatomical position, the radius lies parallel to the ulna on the lateral side.
Radius lies lateral to the ulna in the anatomical position. Hence, the given blank can be filled with 'lateral'.
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