A specific example of a plane joint is the acromioclavicular joint.
Understanding Plane Joints
Plane joints, also known as gliding joints, allow for gliding or sliding movements in one plane. These joints are characterized by two flat or slightly curved bone surfaces that articulate with each other. Due to their structure, they primarily facilitate short, non-axial movements.
Acromioclavicular Joint as a Plane Joint
The acromioclavicular joint, located between the acromion of the scapula (shoulder blade) and the clavicle (collarbone), exemplifies a plane joint. This joint allows for movements such as:
- Upward and downward rotation of the scapula.
- Protraction and retraction of the scapula.
- Anterior and posterior tilting of the scapula.
These movements are essential for shoulder function and overall upper limb mobility. While the range of motion at the acromioclavicular joint is limited, it plays a crucial role in coordinating movements between the scapula and the clavicle.
Other Examples of Plane Joints
Besides the acromioclavicular joint, other instances of plane joints include:
- Intercarpal and intertarsal joints in the wrists and ankles.
- The 2nd through 7th sternocostal joints.
- Vertebral transverse and spinous processes.
These joints, similar to the acromioclavicular joint, facilitate gliding or sliding movements, contributing to the overall flexibility and mobility of the respective body regions.
