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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 .
The sella turcica is located in the sphenoid bone behind the chiasmatic groove and the tuberculum sellae.It belongs to the middle cranial fossa. [1]The sella turcica's most inferior portion is known as the hypophyseal fossa (the "seat of the saddle"), and contains the pituitary gland (hypophysis).
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.
The inferior surface is oval, concave from side to side, convex from before backward, so as to form a saddle-shaped surface for articulation with the base of the first metacarpal bone. This saddle-shaped articulation is partially responsible for the thumb's opposable motion. The dorsal surface is smooth. The palmar surface is narrow and rough.
In this photo both the free position and the saddle shape of the first CMC joint and the proximal transverse palmar arch are clearly visible. The carpometacarpal joint of the thumb ( pollex ), also known as the first carpometacarpal joint, or the trapeziometacarpal joint (TMC) because it connects the trapezium to the first metacarpal bone ...
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.
calcaneus, cuboid bone: Identifiers; TA98: A03.6.10.204: TA2: 1938: FMA: ... The calcaneocuboid joint is a type of saddle joint between the calcaneus and the cuboid ...
A swayed back is a predisposing cause of "kissing spines." A sway back can also be linked to back soreness to a horse's saddle because most saddles will "bridge," putting the rider's weight only on the front and the back of the saddle, creating abnormal pressure points, especially over the shoulders and loins.
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