Ribs Resp

• The Ribs

  • 12 pairs
  • Attach posteriorly to the thoracic vertebrae
  • Slope inferiorly as curve anteriorly

  
• The Ribs

  • True ribs 1 to 7
  • False ribs 8 to 10
  • Floating ribs 11 & 12

  
• The Ribs

  • Increase in length from pair 1 - 7
  • Decrease in length from pair 8 - 12

  
• Typical Rib:

  A) head

  B) neck

  C) tubercle

  D) angle

  E) costal groove

  F) shaft

  
• Movements of the Ribs:

  • For respiration to occur dimensions of the thorax must change
  • Ribs 1 to 5 move in a pump handle fashion to increase anteroposterior diameter of thorax
  • Ribs 8 to 10 move in a bucket handle fashion to increase lateral diameter of thorax