The Skeletal System

5 Functions of the Skeletal System:

• Shape and Support• Movement• Protection of internal organs

• Production of blood cells• Storage of vitamins & minerals

The backbone or vertebral column is the center of the skeleton.

The backbone is made up of 26 small bones called vertebrae.

Parts of the Bone• Compact Bone

• Spongy Bone

• Bone Marrow

• Peristeum (Outer Membrane)

The spaces in bone contain a soft connective tissue called marrow. The job of the bone marrow is to make blood cells.

Cartilage• connective tissue that is

more flexible than bone.

Joints• places in

the body where two bones come together.

Immovable joints connect bones in a way that allow little or no movement.

Moveable joints allow the body to make a wide range of movement.

There are 4 types of moveable joints:

Ball-and-socket

Hinge

Gliding

Pivot

Ball–and–Socket Joint• allows the widest

range of motion.• shoulder and hip

are examples.

Hinge Joint• allows movement

in one plane.• knee and elbow

are examples.

Gliding Joints• provides sliding

movement.• ankle and wrist are

examples.

Pivot Joints

• allows rotation.• the neck is an

example.

• strong connective tissue that hold bones together

Ligaments

Note: ACL tear is a common injury for football and basketball players. Why ?

Osteoporosis is a condition in which the body’s bones become weak & break easily.