Your wrist is composed of eight little bones (carpal bones) in addition to two long bones in your lower arm — the span and the ulna. The most regularly harmed carpal bone is the scaphoid bone, situated close to the foundation of your thumb. These eight little bones of the carpal are the ones that help in the entire movement of the fingers and the wrist. If this bone is fractured or breaks, then there are some severe damages that can be caused to the entire flow movement of the wrist. These are little in size as compared to others, so are somewhat delicate and sensitive as well.