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thorax

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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muscles
origin
insertion
function
Intercostal (internal)   superior margin of each rib   inferior border of next rib above   expiration; depresses ribs (25% of breathing)  
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Rectus Abdominus   pubic crest and symphysis   xiphoid process and inferior ribs   flexes vertebral column; depresses thorax; compresses abdomen (sit ups / crunches)  
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External Abdominal Oblique   fifth to twelfth ribs   Illiac crest, inguinal ligament, and rectus sheath   flexes and rotates vertebral column; compresses abdomen, depresses thorax (twisting flexion)  
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Internal Abdominal Oblique   Illiac crest, inguinal ligament and lumbar fascia   tenth to twelfth ribs and rectus sheath   flexes and rotates vertebral column; compresses abdomen, depresses thorax (twisting flexion)  
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Transversus Abdominus   seventh to twelfth costal cartilages ,lumbar fascia, Illiac crest, and inguinal ligament   Xiphoid process, linea alba, and pubic tubercle   compresses abdomen ( use this when you go #2)  
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Quadratus Lumborum   Illiac crest and lower lumbar vertebrae   twelfth rib and upper lumbar vertebrae   rotates vertebral column and depresses 12th rib (twisting flexion)  
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passive   * diaphragm * intercostals   -------------------------------------------------------------------------------   -------------------------------------------------------------------------------  
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active   *diaphragm *intercostals *QL(ex breathing out) *scalenes (pulling up inhale) *sternocleidomastoid(inhale) *abs (exhale)   --------------------------------------------------------------------------------   -------------------------------------------------------------------------------  
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Diaphragm   Interior of the ribs, sternum, and lumbar vertebrae   central tendon of the diaphragm   inspiration, depress floor of the thorax (75% of breathing)  
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Intercostal (external)   inferior margin of each rib   superior border of next rib below   Inspiration; elevates ribs (25% of breathing)  
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Created by: Sierra987
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