Final answer:
Synarthrotic joints are immobile, amphiarthrotic joints allow some movement, and diarthrotic joints are freely movable. The movement of a joint is determined by both its functional classification and structural classification.
Step-by-step explanation:
Joints are classified based on their structure and movement capabilities. Synarthrotic joints are immobile and found in fibrous joints, where dense connective tissue holds bones together, providing stability (e.g., sutures in the skull). Amphiarthrotic joints allow limited movement and are seen in cartilaginous joints, where cartilage connects bones, allowing flexibility (e.g., pubic symphysis).
Diarthrotic joints are freely movable and fall under synovial joints, characterized by a joint capsule, synovial fluid, and articular cartilage (e.g., knee and shoulder). Diarthrotic joints exhibit the greatest range of movement due to their synovial structure, allowing flexion, extension, abduction, adduction, and various rotations. The amount of movement increases progressively from synarthrotic to amphiarthrotic to diarthrotic joints.