1. Skeleton - a framework of living bones that
supports your body
2. Skeletal system – all the bones
in your body make up
the skeletal system
3. There are 206 bones
in the human body
• The skeleton has five major functions:
1) Gives shape and support to your body
2) Protect your internal organs
3) Help major muscles move
4) Form blood cells
5) Store calcium and phosphorous
4. The periosteum is the tight-fitting membrane
that covers living bone.
5. Compact bone is the hard
layer of bone directly under
6. Spongy bone is found at the ends of long bones
and has many small, open spaces to make bones
7. Marrow is a substance found in the spaces in
long bones. Marrow can be yellow (composed of
fat cells) or red.
red blood cells.
7. Cartilage is a smooth, thick layer of tissue that
covers the ends of bones.
- cartilage is flexible; it acts as a shock absorber
and makes movement easier
8. A joint is any place where two bones come
9. Ligaments are the tough bands of tissue that hold
joints in place
* Joints are generally classified as moveable or
10. An immoveable joint
allows little or no movement.
The joints of the bones in
the skull are immoveable.
• There are 4 types of moveable joints:
1) Pivot joint – one bone rotates in the ring of
another bone; the bones that allow you to turn
your head are pivot joints
2) A ball and socket joint consists of a bone with a
rounded end that fits into a cuplike cavity in
another bone. (hips, shoulders…)
3) A hinge joint moves back and forth like a door
hinge. (elbows, knees, fingers…)
4) A gliding joint is a joint in which one part of a
bone slides over another. (wrists, ankles…)
11. Arthritis is the most common joint problem.
- the word arthritis describes more than 100
different diseases that can damage joints
- osteoarthritis is caused by a breakdown of
- rheumatoid arthritis is a condition in which the
body’s immune system destroys its own tissues