Saddle joint
Saddle Joint
A Saddle Joint (pronunciation: /ˈsædl dʒɔɪnt/) is a type of synovial joint that allows movement in two directions. The name "saddle joint" comes from the way the two bones fit together, similar to a rider sitting on a saddle.
Etymology
The term "saddle joint" is derived from the English word "saddle", which refers to a seat for a rider on the back of a horse, and the word "joint", which in this context refers to the point where two bones are connected to allow movement.
Anatomy
In a saddle joint, one bone forms a saddle shape, and the other bone sits on it like a rider on a saddle. This allows the bones to move in two directions: back and forth, and side to side. The most common example of a saddle joint in the human body is the thumb joint, where the metacarpal of the thumb and the trapezium bone in the wrist meet.
Related Terms
- Synovial Joint: A type of joint that is surrounded by a thick, fluid-filled capsule, allowing a greater range of motion.
- Metacarpal: One of the five bones in the hand.
- Trapezium Bone: A bone in the wrist that is part of the carpal bones.
- Carpal Bones: The eight small bones that make up the wrist.
See Also
External links
- Medical encyclopedia article on Saddle joint
- Wikipedia's article - Saddle joint
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