Diarthrosis

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Diarthrosis

Diarthrosis (pronounced: die-arth-rosis), also known as synovial joint, is a type of joint that allows for free movement in the body. The term is derived from the Greek words "dia" meaning through, and "arthrosis" meaning joint.

Definition

A diarthrosis is a joint that is surrounded by a joint capsule, which contains a lubricating synovial fluid. This type of joint allows for a wide range of movements, including flexion, extension, abduction, adduction, rotation, and circumduction.

Types of Diarthrosis

There are six types of diarthrosis joints, each allowing for different types of movement. These include:

  • Ball and socket joint - This type of joint allows for movement in all directions. Examples include the hip and shoulder joints.
  • Hinge joint - This type of joint allows for movement in one direction, similar to a door hinge. Examples include the elbow and knee joints.
  • Pivot joint - This type of joint allows for rotation around a single axis. An example is the joint between the first and second vertebrae of the neck.
  • Condyloid joint (or ellipsoidal joint) - This type of joint allows for movement in two directions. An example is the wrist joint.
  • Saddle joint - This type of joint allows for movement in two directions, similar to a condyloid joint, but with greater flexibility. An example is the thumb joint.
  • Plane joint (or gliding joint) - This type of joint allows for sliding or gliding movements. Examples include the joints between the tarsal bones of the foot.

Related Terms

  • Synovial fluid - The lubricating fluid found within a diarthrosis joint.
  • Joint capsule - The fibrous tissue that surrounds a diarthrosis joint.
  • Cartilage - The smooth tissue that covers the ends of bones in a diarthrosis joint.

External links

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