Muscles of the Thoracic WallThis is a featured page

-- Muscle Origin Insertion NerveAction --

External intercostals
  • Lower border of ribs
  • Upper border of rib below
  • Intercostal
  • Elevate ribs in inspiration
Internal intercostals
  • Lower border of ribs
  • Upper border of rib below
  • Intercostal
  • Elevate ribs (interchondral part); depress ribs
Innermost intercostals
  • Lower border of ribs
  • Upper border of rib below
  • Intercostal
  • Elevate ribs
Transversus thoracis
  • Posterior surface of lower sternum and xiphoid
  • Inner surface of costal cartilages 2–6
  • Intercostal
  • Depresses ribs
Subcostalis
  • Inner surface of lower ribs near their angles
  • Upper borders of ribs 2 or 3 below
  • Intercostal
Elevates ribs
  • Levator costarum
  • Transverse processes of T7 T11
  • Subjacent ribs between tubercle and angle
  • Dorsal primary rami of C8 T11
  • Elevates ribs

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AndyC
AndyC 		Latest page update: made by AndyC , Sep 21 2010, 8:24 PM EDT (about this update About This Update AndyC Edited by AndyC


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Keyword tags: gross anatomy muscles skeleton thorax
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