1. COMPARATIVE VERTEBRATE ANATOMY OF SKELETAL SYSTEM

2. BONE
Inorganic components -60% of the dry weight Organic component -Primarily collagen

3. FUNCTIONS:
Support
Movement
Protection
Storage
Blood-cell Production

4. 2 basic structural types of bone:
Compact Bone - forms the outer shell of all bones and also the shafts in long bones Spongy Bone - found at the expanded heads of long bones and fills most irregular bones

6. Bone Formation
-Begins with a blastema -These cells develop FIBROBLASTS or OSTEOBLASTS Fibroblasts -form collagen Osteoblasts -form bone cells.

8. Ossification Intramembranous Ossification -Membrane bone formation
Ex. Lower Jaw, Skull, etc.
Endochondral Ossification
-Replacement of Bone

9. Skeletal elements: Dermal skeleton Endoskeleton
-skin of most living vertebrates
Endoskeleton
Somatic - Axial and Appendicular Skeleton
Visceral - cartilage or bone associated with gills & skeletal elements
(such as jaw cartilages) derived from them.