rotatory joint
Học thuậtThân thiện
Definition
- Noun:
- A type of synovial joint: A
rotatory jointis a freely moving joint (a diarthrosis) where the primary, and often only, possible movement is a rotation around a central axis. This axis is typically a single, fixed point or a peg-like process of one bone fitting into a ring or notch of another.
Usage
- The term is a technical, anatomical term. It is synonymous with the more commonly used term pivot joint in anatomical and medical contexts.
- It is used to describe the specific biomechanical function and structure of certain joints in the body.
Examples
- Noun:
- The atlantoaxial joint, connecting the first two vertebrae, is a classic example of a
rotatory joint, allowing the head to turn from side to side. - In the forearm, the proximal radioulnar articulation is a
rotatory jointthat enables the rotation of the palm (pronation and supination).
Advanced Usage
- Functional Classification: In anatomy, joints are classified by their function (the degree of movement they allow). A is a type of uniaxial joint, meaning it permits movement around only one axis.
- Structural Classification: Structurally, it is a type of synovial joint, characterized by a joint cavity filled with synovial fluid.
Variants and Related Words
- Pivot Joint (n): The standard, more frequently used synonym for in anatomical nomenclature.
- Trochoid Joint (n): An alternative, less common technical term for the same joint structure.
- Rotation (n): The primary movement allowed by a rotatory joint.
- Uniaxial Joint (n): The functional category to which rotatory/pivot joints belong.
Synonyms
- Pivot joint
- Trochoid joint
Antonyms
- Immovable joint (synarthrosis): A joint permitting little or no movement, like the sutures of the skull.
- Multiaxial joint: A joint allowing movement around multiple axes, such as a ball-and-socket joint (e.g., the hip).
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