KERMOAL / BSIP / SCIENCE PHOTO LIBRARY KERMOAL / BSIP / SCIENCE PHOTO LIBRARY
Bones of the forearm. Artwork of a frontal view of the radius and ulna, the bones of the forearm, with cartilage (blue) at the joints. The ulna (right) is the longer of the two bones. They are connected at their upper ends by the oblique cord ligament. Further down, the interosseous membrane is a thin fibrous sheet that acts like a ligament and helps to stabilise the alignment of these bones and separate the muscles of the forearm. The heads of the radius and ulna articulate with each other and with the humerus at the elbow joint. The lower ends of both bones articulate with each other and form part of the wrist joint.
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