The Skeletal System Parts of the skeletal system Bones (skeleton- greek word for dried up body) Joints Cartilages Ligaments Divided into two divisions Axial skeleton (Skull,Vertebrae and thoracic cavity) Appendicular skeleton (All the rest) Slide 5.1 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Functions of Bones Support of the body (anchors organs in place, legs act as pillars to support the body) Protection of soft organs (Skull froms case around the brain, vertebrae-spinal cord) Movement due to attached skeletal muscles (tendons attach to bones which act as levers to move the body) Storage of minerals (Ca for neural messages and clotting, P for ATP and waste removal) and fats (yellow marrow inside bones) Hematopoiesis (Blood cell formation in red marrow) Slide 5.2 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

Bones of the Human Body The skeleton has 206 bones Two basic types of bone tissue Compact bone Homogeneous Spongy bone Small needle-like pieces of bone Many open spaces Figure 5.2b Slide 5.3 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings