What type of joints are classified as free-moving and are surrounded by joint capsules?

Synovial joints are classified as free-moving because they allow a wide range of motion between the articulating bones. These joints are characterized by the presence of a joint capsule, which is a fibrous structure that surrounds the joint and encloses the synovial fluid. This fluid lubricates the joint, reducing friction and allowing for smooth movement. Additionally, synovial joints often feature other components such as cartilage that cover the ends of the bones, ligaments that provide stability, and sometimes menisci or bursae that help facilitate movement and absorb shock.

The other types of joints, such as cartilaginous joints, are limited in movement due to the presence of cartilage between the bones, which restricts flexibility. Fibrous joints are typically immobile and are connected by dense connective tissue, providing stability but no movement. Immovable joints, as the name suggests, do not allow any movement, further distinguishing them from synovial joints, which are designed for a wide range of motion.