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U2: Thoracic Cage

Thoracic Cage

Thoracic Cage or Bony Thorax includes sternum, ribs, and costal cartilages
Sternum flat bone to which 10 of 12 pairs of ribs attach via costal cartilages; parts are manubrium, body, and xiphoid process
Manubrium superior portion of sternum; medial end of clavicles articulate with it, has suprasternal/jugular notch
Body middle and largest portion of sternum
Xiphoid process inferior tip portion of sternum; usually blue on models b/c made of hyaline cartilage
Ribs 12 pairs; all articulate posteriorly with thoracic vertebrae
First 7 pairs of ribs true ribs which attach directly to sternum via costal cartilages
Last 5 pairs of ribs (pairs 8-12) false ribs
Rib pairs 8-10 false ribs whose costal cartilages do not exten all the way to the sternum, but join the cartilages associated with more superior ribs; have only indirect attachment to the sternum
Rib pairs 11-12 false ribs that are more specifically designated as “floating” ribs b/c have no costal cartilages and no attachment to sternum
Intercostal spaces space between ribs and costal cartilages that are filled with breathing-related skeletal muscles named external intercostals (asstd. w/ inhalation/inspiration) and internal intercostals (asstd. w/exhalation/expiration)
Created by: mbtrimm