This document defines key terms related to the skeletal system, including types of bone movements like abduction, adduction, and circumduction. It also defines important bone and joint-related structures like cartilage, ligaments, tendons, and synovial joints. Additionally, it identifies calcium and minerals as vital for healthy bones and lists vertebrae as the bones that make up the spinal column.

1. Skeletal System Key Words

2. Abduction – limb movement away from the middle line of the body

3. Adduction - limb movement away towards the middle line of the body

4. Calcium – mineral that is vital to healthy bones, found in milk, cheese and yoghurt

5. Cartilage – a tough but flexible tissue that cushions and protects many bones in the skeleton

6. Circumduction – movement in which the end of the bone moves in a circle

7. Extension – limb movement straightening a joint

8. Joint – a place where two or more bones meet

9. Ligament – a band of tough fibrous tissue which binds bones together at a joint

10. Rotation – circular movement in which part of the body turns whilst the rest remains still

11. Skeleton – the bony framework of the body

12. Synovial joint – joint containing synovial fluid, allowing a wide range of movement

13. Tendon – strong cords of fibrous tissue which fix muscles to bone

14. Vertebrae – irregular bones which make up the vertebral column