1. The Skeletal System

2. Definition: –all the bones in the body

3. The Skeletal System Function –forms an internal, living framework that provides shape and support protects internal organs moves bones forms blood cells stores calcium and phosphorous compounds for later use

4. Bones Made of layers of living tissue Covered with a tough, tight-fitting membrane called the periosteum

5. Compact Bone Directly under the periosteum Hard, strong layer Gives bones strength Contains deposits of calcium phosphate Contains bone cells and blood vessels

6. Spongy Bone Located at the ends of long bones Has many small, open spaces that make bones lightweight Filled with a substance called marrow –yellow composed of fat cells –red produces red blood cells

7. Cartilage Smooth, slippery, thick layer of tissue Covers the ends of bones Does not contain blood vessels or minerals Flexible and acts as a shock absorber Makes movement easier by reducing friction

9. Joints Definition: –Any place where two or more bones come together

10. Joints Kept far enough apart by a thin layer of cartilage so that they do not rub against each other as they move Bones are held in place at joints by a tough band of tissue called ligament

11. Types of Joints Immovable –Skull –Pelvis Moveable –Pivot –Ball & socket –Hinge –Gliding

12. Types of Joints Ball and Socket Joint Bone with a rounded end that fits into a cuplike cavity on another bone http://www.shockfamily.net/skeleton/JOINTS.HTML

13. Types of Joints Pivot Joint One bone rotates in a ring of another bone that does not move http://www.funhousefilms.com/b-pivot2.jpg

14. Types of Joints http://www.shockfamily.net/skeleton/JOINTS.HTML Hinge Joint Back-and- forth movement like hinges on a door

15. Type of Joints http://www.shockfamily.net/skeleton/JOINTS.HTML Gliding Joint One part of a bone slides over another bone