The ulna is the third and final bone of the arm. http://www.learnbones.com/arm-bones-anatomy/
The triangular fibrocartilage complex (TFCC) is a cartilage structure located on the small finger side of the wrist that, cushions and supports the small carpal bones in the wrist. The TFCC keeps the forearm bones (radius and ulna) stable when the hand grasps or the forearm rotates. An injury or tear to the TFCC can cause chronic wrist pain.
Arm Reliquary of Charlemagne (Charles the Great), 1481 in the Aachen Cathedral (Aachener Dom) Treasury - Aachen Germany. The bones of Charlemagne's right forearm are contained in this arresting reliquary made in 1481 AD.
Carpal bones in the human hand. This visually shows the forearm bones (ulna and radius) connecting to the carpal bones at the base of the hand (wrist.) The finger bones extend from the carpals. The name for the finger bones is "meta carpals" for the lower bones and "phalanges" for the finger tips. #joints
The wrist is the location at which the two forearm bones — the ulna and radius — make contact with the various carpal bones of the hand. A break or fracture is caused by a large fall or excessive force against the bone. It is most common in the wrist end of the radius and occurs less often in the ulna and the scaphoid of the carpal...
Did you know? Whales’ flippers, or pectoral fins, share bone structure with the human arm and hand. In fact, the bones of cetacean flippers are the same kinds of bones as in the human arm, with an upper arm bone, two forearm bones, and hand, wrist, and finger bones. In whales, fingers are elongated and may have additional bones.