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The Skeletal System. Definition: –all the bones in the body.

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Presentation on theme: "The Skeletal System. Definition: –all the bones in the body."— Presentation transcript:

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

8

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


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