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A saddle joint (sellar joint, [1] [2] articulation by reciprocal reception [citation needed]) is a type of synovial joint in which the opposing surfaces are reciprocally concave and convex. It is found in the thumb , the thorax , the middle ear , and the heel .
Joining tubular members in metalworking is also referred to as a cope, or sometimes a "fish mouth joint" or saddle joint. [1] Most English-speaking countries outside the United States use the terms scribe and scribing. Coping is commonly used in the fitting of skirting and other mouldings in a room. It allows for clean joints between ...
A multiaxial joint, such as the hip joint, allows for three types of movement: anterior-posterior, medial-lateral, and rotational. A multiaxial joint (polyaxial joint or triaxial joint) is a synovial joint that allows for several directions of movement. [9] In the human body, the shoulder and hip joints are multiaxial joints. [10]
The TMC joint is a synovial joint between the trapezium bone of the wrist and the metacarpal bone at the base of the thumb. This joint is a so-called saddle joint (articulatio sellaris), unlike the CMC joints of the other four fingers which are ellipsoid joints. [17] This means that the surfaces of the TMC joint are both concave and convex.
One drawback to this joint is the difficulty in making it because of the precise measuring and tight cutting required. In its most basic form, a mortise and tenon joint is both simple and strong. There are many variations of this type of joint, and the basic mortise and tenon has two components: the mortise hole, and; the tenon tongue.
The sternoclavicular joint or sternoclavicular articulation is a synovial saddle joint between the manubrium of the sternum, and the clavicle, and the first costal cartilage. The joint possesses a joint capsule , and an articular disc , and is reinforced by multiple ligaments.
The calcaneocuboid joint is conventionally described as among the least mobile joints in the human foot.The articular surfaces of the two bones are relatively flat with some irregular undulations, which seem to suggest movement limited to a single rotation and some translation.
A saddle point (in red) on the graph of z = x 2 − y 2 (hyperbolic paraboloid). In mathematics, a saddle point or minimax point [1] is a point on the surface of the graph of a function where the slopes (derivatives) in orthogonal directions are all zero (a critical point), but which is not a local extremum of the function. [2]