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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!