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The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
The Skeletal System
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The Skeletal System

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Transcript

  • 1. 17.2 The Skeletal System Life Science, Ms. Wells
  • 2. Functions of Skeletal System
    • Provides all movement
    • Works with Muscles
      • Skeletal System + Muscular System = Musculoskeletal System
  • 3. Bone Shapes
    • Long Bone = in arms & legs
    • Short Bone
      • in feet & hands
  • 4. Bones Shapes
    • Irregular Bones = spinal column (vertebrae)
    • Flat Bones = ribs, skull
  • 5. Bones are Connective Tissue!
  • 6. Bone Types
    • Compact Bone
      • Solid layer
      • Outer layer
      • Very strong
      • Dense calcium network
    • Spongy Bone
      • Lightweight, STRONG
      • Full of holes (for blood vessels)
      • Middle layer
  • 7. Calcium Network
  • 8. Spongy Bone
  • 9. Joints
    • Function: allow for movement or to create a seal between 2 bones
    • Definition: any place where 2 bones meet
  • 10. Immovable Joints
    • NO movement/motion
    • Example: Skull
    • Bones in skull are fused together to seal brain inside
  • 11. Slightly Movable Joints
    • Can “give” a little, more flexible
    • But usually don’t move much
    • Example: Ribs
  • 12. Freely Movable Joints
    • Bones glide back & forth past each other
    • Lots of motion
    • Many types
      • Hinge
      • Pivot
      • Ball and Socket
  • 13. Freely Movable: PIVOT Joint
    • Motion: twist a door knob
    • Example: wrist
  • 14. Freely Movable: HINGE Joint
    • Motion: open and close only one way
    • Example: knee, elbow
  • 15. Freely Movable: BALL AND SOCKET
    • Motion: throwing a baseball
    • Example: shoulder, thigh bone to hips
  • 16. Ligaments
    • Connective tissue that holds bones together @ joints
    • Stretchy
  • 17. Osteoporosis
    • Osteo- = bone
    • -porosis = break down, porous, holes
    • Loss of density in bone
    • Calcium network thins
    • Bones become brittle
    • Effects women more than men
  • 18. “ Soft Spot” or Fontanelle
    • Immovable skull joints are not entirely fused in infants
    • Easier to squeeze big head out of mother
  • 19. Cartilage
    • Bones missing the CALCIUM network!
    • Flexible, soft
    • Example: ears, nose, lining of joints
    • All bones start out as cartilage
    • Add calcium to harden = OSSIFY
  • 20. Cartilage & Joints
    • Cushions joints so bones don’t grind
    • Arthritis = cartilage covering bones in joints wears down which causes pain and limits movement
  • 21. THE END!

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