1. The Skeletal System

2. What is a Bone? The skeletal system is made up of the bones and cartilage that forms the framework of your body. The skeletal system is made up of the bones and cartilage that forms the framework of your body. We have bones so that we are not a puddle of skin and guts on the floor. We have bones so that we are not a puddle of skin and guts on the floor. Babies have 300 bones. Babies have 300 bones. Adults have 206 bones. Adults have 206 bones. Click on the Hand to watch a video on bones! Quit Main Menu

3. The Inside of a Bone A bone is made up of salts, water, and tissue. A bone is made up of salts, water, and tissue. Inside a bone there is a jelly substance called bone marrow. Inside a bone there is a jelly substance called bone marrow. Bone marrow produces blood cells for the body. Bone marrow produces blood cells for the body. Quit Main Menu

4. Four Main jobs of a Bone: 1. To protect your body and give it shape. 2. To protect your internal organs. 3. They are attached to muscles, allowing you to move. 4. To store minerals and make blood cells. Quit Main Menu

5. The Spine The spine is the central support for the body. It is a flexible chain of bones. The spine is the central support for the body. It is a flexible chain of bones. The spine is made up of separate bones called vertebrae. The spine is made up of separate bones called vertebrae. Between each vertebrae is cartilage which keeps bones from rubbing against each other. Between each vertebrae is cartilage which keeps bones from rubbing against each other. FUN FACT: there are 26 vertebrae in the human body. FUN FACT: there are 26 vertebrae in the human body. Quit Main Menu

6. Ribs “Your rib cage is made up of 12 vertebrae, 24 ribs and a breastbone in three parts. It protects your heart and lungs from knocks and bumps.” “Your rib cage is made up of 12 vertebrae, 24 ribs and a breastbone in three parts. It protects your heart and lungs from knocks and bumps.” Quit Main Menu

7. Hips and Legs The hip bone helps us to stand upright and move. The hip bone helps us to stand upright and move. The main bones of the legs are the tibia, fibia, and femur. The main bones of the legs are the tibia, fibia, and femur. The patella (kneecap) is also important! The patella (kneecap) is also important! Quit Main Menu

8. Arms The bones in the arm are very flexible. The bones in the arm are very flexible. The three bones that make up the arm are the ulna, radius, and humerus. The three bones that make up the arm are the ulna, radius, and humerus. The two bones that form the shoulder are the clavicle and the scapula. The two bones that form the shoulder are the clavicle and the scapula. Quit Main Menu

9. Joints The Pivot Joint Hinge Joint The Gliding Joint Ball-and-socket Joint View More on Joints! Quit Main Menu

10. Pivot Joint A joint where one bone rotates about another. It moves in a similar way to a door hinge but is characterized by a circular type of motion. A joint where one bone rotates about another. It moves in a similar way to a door hinge but is characterized by a circular type of motion. Examples of pivot joints include the bones in the skull and two small bones in the neck or the ‘cervical vertebrae’ Examples of pivot joints include the bones in the skull and two small bones in the neck or the ‘cervical vertebrae’

11. Hinge Joint A flexible joint that moves back and forth like your knee and elbow. A flexible joint that moves back and forth like your knee and elbow.

12. Gliding Joint A joint that allows bones to glide past each other. There are gliding joints in your ankles, wrists and spine A joint that allows bones to glide past each other. There are gliding joints in your ankles, wrists and spine

13. Ball-and-Socket Joint A joint in which a ball moves within a socket so as to allow motion in every direction within certain limits, like your shoulder. A joint in which a ball moves within a socket so as to allow motion in every direction within certain limits, like your shoulder.