Final answer:
Joints are structurally classified as fibrous, cartilaginous, and synovial, with synovial joints being the most mobile, allowing for movements such as angular and rotational.
Step-by-step explanation:
The structural classification of joints segments them into fibrous, cartilaginous, and synovial types. Fibrous joints consist of bones connected by fibrous connective tissue, with very limited movement capability - an example being the sutures in the skull. Cartilaginous joints, on the other hand, feature bones united by cartilage, allowing for more movement than fibrous joints, but less than synovial joints; the joints between vertebrae are a common example.
The most mobile, however, is the synovial joints, characterized by a fluid-filled cavity between articulating bones, facilitating a wide range of movements including angular and rotational. Cartilaginous joints are joints in which the bones are connected by cartilage. Synovial joints are joints that have a space between the adjoining bones. The movement of synovial joints includes angular and rotational movements.