Diarthroses

Definition

Diarthroses are joints that allow for free movement in various directions. These are also known as synovial joints and are the most common type of joint in the human body.

5 Must Know Facts For Your Next Test

1. Diarthroses contain a synovial cavity filled with synovial fluid which lubricates the joint.
2. They have a joint capsule composed of an outer fibrous layer and an inner synovial membrane.
3. Examples include the shoulder, hip, knee, and elbow joints.
4. They allow for different types of movements such as gliding, angular, rotational, and special movements like inversion and eversion.
5. Articular cartilage covers the ends of bones in diarthroses to reduce friction and absorb shock.

Review Questions

• What is another name for diarthroses?
• Describe two main structural components of a diarthrotic joint.
• List three examples of diarthrotic joints in the human body.

Related terms

Synovial Fluid: A viscous liquid found in synovial cavities that reduces friction between articular cartilages during movement

Articular Cartilage: The smooth tissue at the ends of bones within a joint that reduces friction and absorbs impact

Joint Capsule: The fibrous sac surrounding a synovial joint, consisting of an outer fibrous layer and an inner synovial membrane