The pivot joint got its name primarily for the movement it allows – pivoting. This is the only movement that occurs in this joint, which is why this joint is considered an uniaxial joint. In order to accommodate this type of movement, the pivot joints usually have a rounded portion of the bone (or axis) around which another bone forms a ring and moves.
A good example of a pivot joint is the atlantoaxial joint which is formed between C1, the atlas, and the dens of C2, the axis. Note that C2 is also called 'the axis' because of the pivot point it creates for the atlas and C1 forms an enclosed ring around the dens thanks to the transverse ligament of the atlas. The rotation of the atlas around the dens is the movement we make when we shake our heads left and right (like when saying 'No').
English: Pivot joint
Latin: Articulatio trochoidea
|Definition||A type of uniaxial synovial joint.|
|Examples||Median atlantoaxial joint, radioulnar joint|
Learn more about the synovial joints with the following study unit:
Pivot joint: want to learn more about it?
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