articulatio trochoidea
Học thuậtThân thiện
The elbow joint contains an articulatio trochoidea that allows the forearm to rotate.
Definition
Noun: A pivot joint is a type of synovial joint in the human body where a rounded or pointed bone process rotates within a ring formed partly by bone and partly by a ligament. This anatomical structure allows movement limited primarily to rotation around a single central axis.
Examples of Usage
- The articulatio trochoidea between the first and second cervical vertebrae (the atlas and axis) allows the head to rotate from side to side.
- In the forearm, the proximal radioulnar joint is a classic example of an articulatio trochoidea, permitting the rotation of the radius around the ulna during actions like turning a doorknob.
Advanced Usage
- Functional Classification: In kinesiology, an articulatio trochoidea is classified as a uniaxial diarthrosis, meaning it is a freely movable joint with one degree of freedom (rotation).
- Clinical Context: Degeneration or injury to an articulatio trochoidea, such as in the atlantoaxial joint, can severely limit rotational movement and cause significant pain.
Variants and Related Words
- Pivot Joint (n): The common English synonym for .
- Trochoid Joint (n): An alternative, less common term derived from the same Greek root ( meaning wheel).
- Rotary Joint (n): A descriptive term emphasizing the joint's function.
Synonyms
- Pivot joint
- Trochoid joint
- Rotary joint
Related Terms (Not Phrasal Verbs)
- Synovial Joint: The broader category of freely movable joints to which the pivot joint belongs.
- Uniaxial Joint: A joint that moves primarily around one axis, like a pivot or hinge joint.
- Rotation: The primary movement allowed by this joint type.
The elbow joint contains an articulatio trochoidea that allows the forearm to rotate.
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