OBJECTIVES •Discuss the five functions of the skeletal system. •Describe the structure of a bone. 206 bones make up the skeleton. The Skeletal System is the body’s living framework. Most of the skeletal system is make up of bones, ligaments, tendons, and cartilage. FUNCTIONS OF THE SKELETAL SYSTEM •Provides shape and support •Allows movement •Protects vital organs and tissues •Stores certain materials •Produces blood cells Axial Skeleton Appendicular Skeleton skull ribs shoulders breastbone arms vertebral column and hands pelvis/hips legs and feet Axial Skeleton http://www.shockfamily.net/skeleton/RIBS.MOV Appendicular Skeleton Development of Bone Structure of Long Bone Figure 6.3a, c Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Structure of Long Bone Figure 6.3a,b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Microscopic Structure of Bone: Compact Bone Figure 6.5a, b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Ball and Socket A ball and socket joint allows for radial movement in almost any direction. They are found in the hips and shoulders. Hinge A hinge joint allows extension and retraction of an appendage. Pivot Pivot joints allow rotation around an axis. The neck and forearms have pivot joints. In the neck the occipital bone spins over the top of the axis. In the forearms the radius and ulna twist around each other. The Skeletal System is the body’s living framework. 206 bones make up the skeleton.