Final answer:
The radius and ulna bones are located in the forearm of the upper limb, between the elbow and wrist joints.
Step-by-step explanation:
The radius and ulna bones are located in the forearm, which is the region between the elbow and wrist joints of the upper limb. In particular, the ulna is found on the medial side (closer to the center of the body), and the radius is on the lateral side (closer to the thumb).
These two bones are crucial for the movement and articulation of the elbow and wrist, allowing for a variable degree of rotation. Together with the humerus, which is the single bone of the upper arm, they form the skeletal structure of the upper limb that extends from the shoulder to the elbow and continues into the forearm.
It is important to note that these bones also articulate with each other and the carpal bones of the wrist, facilitating the complex movements of the hand. Each upper limb consists of 30 bones, including the bones of the carpus (wrist), metacarpus (palm), and phalanges (digits).