Syndesmoses are the third type of fibrous joint. In this type of joint, apposed bones are joined by a fibrous membrane (interosseous membrane) or a ligament. These joints are amphiarthroses (slightly moveable) and are maintained as fibrous unions throughout life. (Syndesmoses do not become synostoses.) Examples of syndesmoses are the attachment of the borders of the radius and ulna, which are connected with an interosseus membrane, the attachment of the borders of the tibia and fibula, which are connected with an interosseous membrane, and the inferior tibiofibular joint which is connected by a ligament.