1. Skeletal System
Unit 4

2. Skeletal System Functions
Protection*
Support*
Movement
Calcium Store
Make Blood
*Not possible without Calcium, bones would be too brittle!

3. Tiny Tidbits There are 206 bones in the body
Largest bone is the femur (thigh bone)
Smallest bones in the ear
Incus
Malleus
Stapes
Marrow: creates blood stem cells that make all formed units in the blood (in the core of long bones)
Suture: type of joint that only occurs in the skull
Unfused at birth (“soft spots”), allows for some movement

5. Bone Marrow Location and Donation

6. Sutures
Infant to Adult

7. 4 Types of Bones in the Body
Long-longer than wide
Ex: Arm/Leg
Short- Roughly cube shaped
Ex: Tarsals/Metatarsals
Flat –thin, generally curved
Ex: Sternum/Ribs
Irregular-complicated
shape, specified for fxn
Ex: Skull/Vertebrae

9. Short Bones

10. Flat Bone = Sternum

11. Irregular Bones

12. Bone Structure Epiphysis: rounded end of a long bone
Diaphysis: long midsection of a long bone
Haversian Canal: series of tubes that surround blood vessels and nerves in compact bone
*Bone Structure Info

13. Haversian Canals

14. Histology-Bone Slide

16. Axial Skeleton: consists of head and trunk, total of 80 bones
Appendicular Skeleton: used for locomotion and manipulation of objects, 126 bones

18. Pelvic Girdle

19. Pelvis with Ligaments

20. Skull/Cranium