Final answer:
A plane joint is a type of synovial joint formed between flat joint surfaces, allowing for multiaxial movement such as sliding motions in different directions.
Step-by-step explanation:
This type of synovial joint is formed by the coming together of flat joint surfaces and is known as a plane joint. Plane joints, such as those found between the bones of the wrist and foot, allow bones to slide past one another in any direction along the plane of the joint. These joints are functionally classified as multiaxial joints, meaning they can move in multiple axes, including plantar flexion – a foot movement at the ankle in which the heel is lifted off the ground.
Synovial joints are the most common type of movable joints in the body and feature a fluid-filled synovial cavity that separates the bones at the joint. This design allows for smoother and more varied movements. The synovial fluid reduces friction and aids in the free movement of the bones, further supported by an articular capsule and articular cartilage.