Transcript BONES!

BONES
The Skeleton
-Contains approx. 206 bones.
-Main function: rigid framework for support,
protection, and storage.
-The human skeleton is divided into two parts:
1. axial (skull, ribs, spine, sternum)
2. appendicular (everything else)
Bone Structure
Bone Marrow --- Red and Yellow


Red Marrow --- Produces red blood cells &
certain types of white blood cells.
Yellow Marrow --- Consists of fat cells & serves
as energy storage.
Bones Continued
Periosteum --- Membrane that contains a network
of blood vessels which supplies nutrients. (Outer
layer of the bone.)
Compact bone --- Allows the bone to endure a
large amount of stress it receives upon impact.
Spongy Bone - Network of connective tissue.
Bone develops from cartilage.
Cartilage is a tough, flexible connective
tissue.
Cartilage will eventually harden during
fetal development in a process called
ossification.
Joints
Joints are places where two bones meet.
Joints are held together by ligaments, tough bands
of connective tissue.
Bursae help to absorb shock & keep bones from
rubbing against each other.
Tendons attach muscle to bones.
Hinge Joint

Found in your elbow.
Allows you to move
arm forward &
backward. Like a
door.
Gliding Joint

Allows bones to slide
over one another.
Example are the
joints between the
small bones of your
feet. Allows your foot
to flex when you walk.
Pivot Joint

Forms the top 2
vertebrae in your
neck. Allows you to
move your head side
to side. (Saying “no”).
Ball & Socket Joint

Found in your
shoulder or hip.
Allows you to move
your arm up & down,
forward & backward,
& rotate in a complete
circle.
Saddle Joint
 Found
at the base of each thumb, allows
you to rotate your thumbs and helps you
grasp objects with your hand.