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The Skeletal System Supports the body Protects soft organs Allows movement due to attached skeletal muscles Stores minerals and fats Blood cell formation.

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Presentation on theme: "The Skeletal System Supports the body Protects soft organs Allows movement due to attached skeletal muscles Stores minerals and fats Blood cell formation."— Presentation transcript:

1 The Skeletal System Supports the body Protects soft organs Allows movement due to attached skeletal muscles Stores minerals and fats Blood cell formation

2 The Skeletal System Parts of the skeletal system –Bones (skeleton) –Joints –Cartilages –Ligaments Two subdivisions of the skeleton –Axial skeleton skull, spine, ribs –Appendicular skeleton shoulders, arms hips, legs

3 Bones of the Human Body The adult skeleton has 206 bones Two basic types of bone tissue –Compact bone –Spongy bone

4 Classification of Bones by shape Long bones –Typically longer than they are wide –Have a shaft with heads at both ends –Contain mostly compact bone –Example : FemurHumerus Shaft

5 Classification of Bones by Shape Short bones –Generally cube-shape –Contain mostly spongy bone –Example : CarpalsTarsals

6 Classification of Bones by Shape Flat bones –Thin, flattened, and usually curved –Two thin layers of compact bone surround a layer of spongy bone –Example : SkullRibsSternum

7 Classification of Bones by Shape Irregular bones –Irregular shape –Do not fit into other bone classification categories –Example : Vertebrae Hip bones

8 Anatomy of a Long Bone Diaphysis –Shaft –Composed of compact bone Epiphysis –Ends of the bone –Composed mostly of spongy bone

9 Anatomy of a Long Bone Periosteum –Outside covering of the diaphysis (shaft) –Fibrous connective tissue membrane

10 Cartilage = Connective Tissue Cartilage –Covers the external surface of long bones –Made of hyaline cartilage –Decreases friction at joint surfaces

11 When youre growing…. Epiphyseal plate –Flat plate of hyaline cartilage seen in young, growing bone (a.k.a. = growth plate) Epiphyseal line –Remnant of the epiphyseal plate –Seen in adult bones

12 Anatomy of a Long Bone Medullary cavity –Cavity inside of the shaft –Contains yellow marrow (mostly fat) in adults. With severe blood loss, can be converted to red marrow –Contains red marrow (for blood cell formation) in infants


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