1. Skeletal System

2. Two Types of Systems
In the human, the skeletal system is an endoskeleton.
This means our support system is internal.
Other organisms have exoskeletons, or outer skeletons.

3. Important Head Bones Cranium – skull, protects the brain
Mandible – jaw bone
Hyoid – protects your vocal chords

4. Important Chest Bones Clavicle – collar bone
Sternum – bone that holds the rib cage together
Ribs – protect the heart
Spine – protects the nervous system
Scapula – shoulder blade
Clavicle
Spine

5. Important Arm Bones Humerus – attaches arm to shoulder
Radius – arm bone (larger bone)
Ulna – arm bone
Carpals – wrist bones
Metacarpals – hand bone
Phalanges – finger bones

6. Important Leg Bones Pelvis – supports the back and legs
Femur – bone that connects to the pelvis
Patella – knee cap
Tibia – leg bone (larger)
Fibula – leg bone
Tarsals – ankle bones
Metatarsals – foot bones
Phalanges – toes
Calcaneous – heel bone
Malleoulus – Ankle bone

7. Axial Skeleton
80 Bones

8. Appendicular Skeleton
126 Bones

9. Bones
Solid network of living cells and protein fibers surrounded by deposits of calcium salts.
Compact bone – hard outer bone surface
Spongy bone - inside of bone, produces blood cells
Periosteum – thin coating on the bone
Haversian Canals – run blood through the bone

10. Bone Marrow
Yellow Marrow – fat in the bone. Replaces red marrow as a person ages.
Red Marrow – forms blood cells. Very predominant in children