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Unformatted text preview: o action: compresses abdomen Muscles used in breathing- diaphragm o origin: xiphoid process of sternum, costal cartilage of lower 6 ribs & lumbar vertebrae o insertion: central tendon o action: increases height & volume of thoracic cavity, resulting in inhalation- external intercostals o origin: superior rib o insertion: inferior rib o action: elevates ribs & increases width & depth of thoracic cavity, resulting in inhalation- internal intercostals o origin: superior rib o insertion: inferior rib o action: further decreases width & depth of thoracic cavity during forced exhalation page3...
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- Fall '10
- Anthropology, Sternum, Iliac crest, pubic symphysis