pivot joint

Thân thiện

The elbow is a pivot joint that allows the forearm to rotate.

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.

Học thuật

Noun

1. 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

Từ đồng nghĩa

• rotary joint
• rotatory joint
• articulatio trochoidea