Which joint is a good example of a fibrous joint?

The skull sutures are a prime example of a fibrous joint, known for their immobility and structural stability. These joints are formed by dense connective tissue that firmly holds the bony plates of the skull together, providing a protective casing for the brain. The lack of movement in these joints enhances the skull's ability to withstand external forces and provides a solid foundation for cranial structure.

In contrast, other types of joints listed, like the shoulder joint, wrist joint, and hip joint, are classified as synovial joints. These joints allow for significant movement and are characterized by a fluid-filled joint capsule, contributing to a wide range of motion required for various physical activities. The rigidity and stability of fibrous joints like the skull sutures differ fundamentally from the dynamic nature of synovial joints, making the skull sutures the correct answer in this context.