Skeletal System

Unit 4

Skeletal System Functions

A. Protection*B. Support*C. MovementD. Calcium StoreE. Make Blood

*Not possible without Calcium, bones would be too brittle!

Tiny Tidbits• There are 206 bones in the body• Largest bone is the femur (thigh bone)• Smallest bones in the ear

o Incuso Malleus o 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 skullo Unfused at birth (“soft spots”), allows for some movement

Bone Marrow Location and Donation

Sutures Infant to

Adult

4 Types of Bones in the Body

• Long-longer than wide Ex: Arm/Leg

• Short- Roughly cube shapedEx: Tarsals/Metatarsals

• Flat –thin, generally curvedEx: Sternum/Ribs

• Irregular-complicatedshape, specified for fxn

Ex: Skull/Vertebrae

Short Bones

Flat Bone = Sternum

Irregular Bones

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

Haversian Canals

Histology-Bone Slide

• Axial Skeleton: consists of head and trunk, total of 80 bones

• Appendicular Skeleton: used for locomotion and manipulation of objects, 126 bones

Pelvic Girdle

Pelvis with Ligaments

Skull/Cranium