Skeletal System

Fun Facts

• Babies have more bones than adults! • Both Humans and giraffes have the same

amount of bones in their necks. • Human thigh bones are stronger than

concrete.• Your ribs move about 5 million times a

year, everytime you breathe! • One quarter of the bones in your body, are

in your feet!

Functions

• Support the body

• Protect organs

• Allow movement

• Store minerals

• Blood cell formation

Types of Joints

• Immovable

• Slightly movable

• Freely movable

We have over 230 moveable and semi-movable joints in our body.

Immovable Joints

• Joints connect bones without allowing any movement.

• Skull and Pelvis

Slightly Movable

• The bones are attached by cartilage. These joints allow for a little movement.

• Spine and Ribs

Freely movable• Cavities between bones are filled with

synovial fluid. This fluid helps lubricate and protect the bones.

• Ball and Socket

• Hinge

• Pivot

• Saddle

Ball and Socket• Hips• Shoulders• They allow you to swing

your arms and legs in many different directions

Hinge

• Open and close like a door

• Elbow and knee

• Animation

Pivot

• Rotation of one bone around another

• Neck and Elbow

Saddle

• This type of joint allows for back and forth and side to side motion but limited rotation.

• Thumb

If you are "double-jointed", it just means that you have extra long ligaments in your joints and can bend them farther than usual.