The ulna articulates proximally with the internal rounded process of the humerus, and distally with the two carpal bones. The secondaries attach to the ulna. They articulate proximally with the radius and ulna. It articulates with the radiale and ulnare. Primaries attach to this composite bone.
Phalanges Compose the skeletal structure of the three digits or fingers that persist in the bird.
A stout, cylindrical bone whose proximal part bends inward and has a prominent head that is received by the pelvic girdle. A small bone found in front of the knee joint. Two bones running parallel to each other. The tibiotarsus is a composite bone that is expanded at its proximal end, where it articulates with the inner rounded process of the femur. It extends to the heel.