pivot joint
Definition
Noun: 1. A type of synovial joint: A pivot joint is a specific anatomical structure where one bone rotates around another within a ring formed partly by the bone and partly by a ligament. This design allows movement primarily limited to rotation around a central axis.
Examples
- Noun:
- The joint between the first and second cervical vertebrae (the atlas and axis) is a pivot joint that allows you to turn your head from side to side.
- In the forearm, the proximal radioulnar articulation is a classic example of a pivot joint, enabling the rotation of the palm.
Advanced Usage
- Functional classification: In kinesiology, a pivot joint is classified as a uniaxial diarthrosis, meaning it allows movement in one plane (rotation).
- Engineering analogy: The mechanical function of a pivot joint is often compared to a wheel rotating on an axle or a door hinge that only allows a turning motion.
Variants and Related Words
- Trochoid joint (n): A technical synonym for a pivot joint.
- Rotary joint (n): A descriptive term sometimes used interchangeably with pivot joint.
- Synovial joint (n): The broader category of freely movable joints to which the pivot joint belongs.
Synonyms
- Trochoid joint
- Rotary joint (in anatomical context)
Related Phrases
- To pivot on: While not a phrasal verb of the noun, the verb "to pivot" describes the rotational action this joint enables.
- The bone pivots on the axis of the joint.
Noun
-
a freely moving joint in which movement is limited to rotation
-
the articulation of the radius and ulna in the arm is a pivot joint
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