Movable joints, also known as synovial joints, are the type of joint that allow for free movement of bones.
Types of Movable Joints
Movable joints are essential for a wide range of bodily movements. These joints are characterized by the presence of a fluid-filled cavity that allows for smooth motion. According to the provided reference, here's a breakdown of what constitutes a movable joint:
- Synovial Joints: All movable joints are synovial joints.
- Free Movement: These joints allow bones to move freely.
- Common Type: Movable joints are the most common type of joint in the human body.
Examples of Movable Joints
Several key joints in the body are classified as movable joints, according to the reference these include:
- Knee: The knee joint allows for bending and straightening of the leg.
- Shoulder: This ball-and-socket joint allows for a wide range of motion, including rotation, flexion, and extension.
- Hip: Similar to the shoulder, the hip joint is also a ball-and-socket joint, facilitating leg movement.
- Elbow: The elbow is a hinge joint that allows for the bending and straightening of the arm.
Summary of Movable Joints
| Joint | Type | Function |
|---|---|---|
| Knee | Synovial | Bending and straightening of the leg |
| Shoulder | Synovial | Wide range of motion; rotation, flexion, extension |
| Hip | Synovial | Wide range of leg movements |
| Elbow | Synovial | Bending and straightening of the arm |
Key Characteristics of Movable Joints
- Synovial Fluid: This fluid lubricates the joint and reduces friction.
- Articular Cartilage: Covers the ends of the bones in the joint, providing a smooth surface for movement.
- Joint Capsule: Encloses the joint and holds the bones in place.
