Pivot joint
Videos
In animal anatomy, a pivot joint is a type of synovial joint whose movement axis is parallel to the long axis of the proximal bone, which typically has a convex articular surface.
1: Ball and socket joint; 2: Condyloid joint (Ellipsoid); 3: Saddle joint; 4 Hinge joint; 5: Pivot joint;
Ulna
Videos
The ulna or ulnar bone is a long bone in the forearm stretching from the elbow to the wrist. It is on the same side of the forearm as the little finger, running parallel to the radius, the forearm's o
Right ulna, lateral aspect. (After Piersol.)
Right ulnar bone, medial aspect. (After Piersol.)
Quill knobs on the ulnae of fossil (top) and modern (bottom) birds.