Final answer:
Planar joints, also known as gliding joints, are synovial joints with flat or slightly curved articulating surfaces, enabling sliding movements. Notable examples include the intercarpal and intertarsal joints, the acromioclavicular joint, and zygapophysial joints of the vertebrae.
Step-by-step explanation:
Understanding Planar Joints
Planar joints, also known as gliding joints, are a specific type of synovial joint. These joints are characterized by bones with articulating surfaces that are flat or slightly curved, enabling the bones to slide or glide against each other. The range of motion in planar joints is typically limited and constrained by surrounding ligaments, and such joints do not allow for rotational movement.
Examples of Planar Joints
Various parts of the human body contain planar joints, including:
- The intercarpal joints of the wrist
- The intertarsal joints of the foot
- The acromioclavicular joint between the clavicle and the acromion of the scapula
- The zygapophysial joints between adjacent vertebrae
Planar joints are functionally classified as multiaxial joints due to the potential for multiple types of movement. However, the specific movements available can vary based on ligament or bone limitations peculiar to each joint.