Non-synovial joints are types of joints in the body that do not have a synovial cavity, meaning they lack the fluid-filled space found in synovial joints. These joints are typically connected by fibrous or cartilaginous tissue, allowing for little to no movement. Examples include sutures in the skull and intervertebral discs in the spine. There are three main types of non-synovial joints: fibrous joints, cartilaginous joints, and syndesmoses. Fibrous joints, like those in the skull, are immovable, while cartilaginous joints, such as those between the vertebrae, allow for slight movement. Syndesmoses are joints where bones are connected by ligaments, permitting limited movement.