Diarthrosis, also known as a synovial joint, is a freely movable joint. This type of joint allows for a wide range of motion, facilitating various bodily movements. The majority of joints in the adult human body are diarthroses.
Characteristics of Diarthroses
- Free Movement: The defining characteristic of a diarthrosis is its ability to permit maximal motion. This contrasts with other joint types which offer limited or no movement. (Merriam-Webster, Dictionary.com, Cambridge English Dictionary)
- Synovial Joints: All diarthroses are synovial joints. This means they possess a fluid-filled cavity (synovial cavity) that lubricates the joint and reduces friction during movement. (Biology Online Dictionary, Classification of Joints – Anatomy & Physiology)
- Examples: Numerous examples exist throughout the body, including the shoulders, hips, knees, elbows, and wrists. These joints enable activities such as walking, running, lifting, and grasping. (Homework.Study.com, Articulations - SEER Training)
Functional Classification of Joints
Diarthroses are part of a broader functional classification of joints:
- Synarthrosis: Immobile joints.
- Amphiarthrosis: Slightly movable joints.
- Diarthrosis: Freely movable joints. (Classification of Joints | Anatomy and Physiology I)
The ability of diarthroses to provide extensive movement is crucial for the flexibility and dexterity of the human body. Their structure, with the synovial fluid and surrounding ligaments, allows for smooth, efficient movement with minimal wear and tear. (Shabdkosh.com)
