**The joint is ovoid** The articular head has the appearance of a spherical joint, to one degree or another, flattened along the axis. The axes of the head and the entire joint lie in the same plane. The joint block contains intercellular fluid lining its surface and auxiliary substances, where they are abundantly located in humans and form a thick watery mass. At a moving joint, the bones are in contact but contain mostly liquid lubrication for smooth and painless movement. They have a flat structure and smooth surfaces, which allows them to move unhindered.
The body of the joint is located between the joints and participates in the formation of the flexible structure of the joints. The joint capsule connects the ends of the sliding bones and protects the connecting parts from external mechanical influence. When we move our arms, the head shrinks without a bone and shakes completely freely. Other similar interfaces, such as intraosseous ones, must also move to prevent bones from contacting each other, but this is achieved at the expense of the elasticity of the muscles and ligaments. The mucous membranes are filled with intra-articular fluid, which softens joint movements and reduces friction. **ABOUT