Pivot joint Pivot joint In animal anatomy, a pivot joint (trochoid joint, rotary joint, lateral ginglymus) is a type of synovial joint. In pivot joints, the axis of a convex articular surface is parallel with the longitudinal axis of the bone. According to one classification system, a pivot joint like the other synovial joint —the hinge joint has one degree of freedom. Note that the degrees of freedom of a joint is not the same as the same as joint's range of motion. Pivot joints allow for rotation, which can be external (for example when rotating an arm outward), or internal (as
Motorcycle saddle Motorcycle saddle A motorcycle saddle is a term for a motorcycle seat in some parts of the world. It is a seat for carrying a rider and, possibly, a passenger, and which is attached to a motorcycle often but not exclusively, behind the fuel tank. There are several types of saddles used on motorcycles. Most common is the "dual saddle" or "benchseat" which is used on the majority of motorcycles today. It allows both the rider and passenger to be seating fore and aft on a single saddle. Dual saddles, that is two separate saddles (and often independently sprung), are