Kidport 5th Grade Science: The Human Arm Bones: A clickable quiz of the human arm bones.
Printable Blank Outline Diagram of the Human Skeleton: Blank diagram of the human skeletal system with answers at the bottom of the page.
Science: Out of This World -- Bones: A basic overview of bone structure, including a quiz.
Skeletal System: Real photographs of the human skeletal system, including a quiz.
Space Bones: NASA science news about preventing the steady loss of bone mass that astronauts encounter. Includes audio and a downloadable file of the article.
The Online Skeleton: Features a PDF download of the human skeleton, with close-ups of each part, and an explanation of the way they are connected.
The Skeletal System: A 14-question interactive quiz.