COMPARATIVE VERTEBRATE ANATOMY OF SKELETAL SYSTEM

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Presentation transcript:

COMPARATIVE VERTEBRATE ANATOMY OF SKELETAL SYSTEM

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

FUNCTIONS: Support Movement Protection Storage Blood-cell Production

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

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

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

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.