National Institute of Health - Introduction to the Skeletal System
National Institute of Health - Introduction to the Muscular System
Khan Academy - The musculoskeletal system
Teens Health - Bones, Muscles, and Joints
Wonderopolis - How many bones are in your body?
Wonderopolis - How do we move?
Wonderopolis - How do bones grow?
Wonderopolis - What is the strongest muscle in your body?
NatGeoKids - Extraordinary X-Rays