| The shoulder, a ball-and-socket joint, can move in almost any direction, says certified trainer Jennifer Zerling. |
| The hip joint is a ball-and-socket joint because the spherical head of the femur moves inside the cup-shaped acetabulum. |
| It is a bath that can be rocked, or inclined in any direction, for its center rests upon a ball-and-socket joint. |
| Supported on a tripod by means of a ball-and-socket joint and screw-tightening device. |
| Specializations for land walking are mainly found in the forelimbs, including a ball-and-socket joint in the shoulder, like that of mammals. |
| Fitted with a ball-and-socket joint for mounting on a tripod, and complete with wooden field case. |
