1. Structure & Function of the bones and joints
The Skeletal System:
Structure & Function of the bones and joints

2. What is a skeleton?
The skeleton is a column of interlinked bones, with two legs attached at the bottom and two arms and a skull attached at the top.

3. The picture to the right is referred to as anatomical position.

4. The Skeletal System Parts of the skeletal system Bones (skeleton)
Joints
Cartilages
Ligaments (bone to bone)(tendon=bone to muscle)
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5. Functions of Bones Support of the body Protection of soft organs
Movement due to attached skeletal muscles
Storage of minerals and fats
Blood cell formation
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6. Bones Your bones protect the important organs in your body.
The skull protects the brain. It is like a hard hat.
Your ribs protect the heart, lungs, and stomach.

7. Bones of the Human Body
You were born with 300 bones. By the time you graduate from high school you will have 206 bones.
How many more bones did you have when you were born than you will have when you graduate?
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8. Bones are classified by their shape:
Long- bones are longer than they are wide (arms, legs)
Short- usually square in shape, cube like (wrist, ankle)
Flat- flat , curved (skull, Sternum)
Irregular- odd shapes (vertebrae, pelvis)

9. Classification of Bones on the Basis of Shape
Figure 5.1
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10. The Skull
The skull is a bony case that supports and protects the brain and some of the body’s sense organs, such as the eyes and ears.
There are 29 different bones in the skull.
The part of the skull that surrounds the brain is called the cranium.

11. The Skull
14 facial bones form the framework for the eyes, nose, cheekbones, and upper and lower jaw.
Upper jaw is called the maxilla.
Lower jaw is called the mandible.
The lower jaw can move from side to side and up and down.

12. Backbone
Your backbone, or spine is a flexible column of bones that runs down the middle of your body.
It is made up of 33 small bones called vertebrae

13. Rib Cage
Your rib cage forms a protective shell for some of your most important organs, including your heart, lungs, stomach, and liver.

14. Collarbone and Shoulder Bone

15. Hands
The hand has 27 bones in three groups: the phalanges in the fingers and thumbs, the carpals in the wrist, and the metacarpal in the palm.

16. Names of Bones Fibula – Lower leg Tibia - Shin Femur – thigh bone
Pelvis - hip bone
Spinal Column - Backbone
Cranium – skull
Ulna & Radius– lower arm bones
Humerus – upper arm bone

17. Bones Bones are made of cells.
Bones are living parts of your body that grow and change just as you do.

18. A Closer Look at Bones
The outside of the bone is hard. It is made up of living bone cells that form rings around tiny canals through which blood vessels pass.
The inside is a honeycomb of bone cells with spaces between them. This is called spongy bone.
Minerals are stored inside the bone.

19. A Closer Look at Bones
The hollow centers of many bones are filled with jellylike red and yellow marrow.
Yellow marrow stores fat and releases it when it is needed elsewhere in the body.
Red marrow is a tissue that makes red and white blood cells and platelets.

20. A Closer Look at Bones
Red bone marrow makes up to five thousand million red bloods cells and thousands upon thousands of white blood cells and platelets each day.

21. A Closer Look at Bones
Red blood cells are the cells that carry oxygen throughout the body.

22. A Closer Look at Bones
White blood cells are the cells that fight disease and infection.

23. A Closer Look Inside
The platelets help the blood to clot after injury.
Scabs

24. Speedy Bone Facts
The femur is the thigh bone. It is the largest bone in the body.
The shortest bone is in your middle ear. It is called the stirrup, or stapes.
More than half the bones in your body are in your hands and feet.
Humans have the same number of neck bones as giraffes and mice.

25. Bone Connection
Bones are connected together by ligaments at the joints.
Cartilage is another kind of connective tissue found in joints and at the ends of bones.
Bones are moved by muscles that are attached to them

26. Joints
A joint is the place where two bones come together.

27. Types of Joints
Hinge- 
A hinge joint allows extension and retraction of an appendage. (Elbow, Knee)

28. Ball and Socket- 
A ball and socket joint allows for radial movement in almost any direction. They are found in the hips and shoulders. (Hip, Shoulder)

29. Gliding- In a gliding or plane joint bones slide past each other
Gliding- 
In a gliding or plane joint bones slide past each other. Mid-carpal and mid-tarsal joints are gliding joints. (Hands, Feet)

30. Saddle- This type of joint occurs when the touching surfaces of two bones have both concave and convex regions with the shapes of the two bones complementing one other and allowing a wide range of movement. (Thumb)