Muscles of the Trunk
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| external intercostals | origin: inferior border of each rib
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| external intercostals | insertion: superior border of next rib
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| external intercostals | action: elevate ribs
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| internal intercostals | origin: superior border of each rib
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| internal intercostals | insertion: inferior border of the preceding rib
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| internal intercostals | action: depress ribs
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| diaphragm | origin: xiphoid process, cartilages of ribs 4-10, and anterior surfaces of lumbar vertebrae
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| diaphragm | insertion: central tendinous sheet
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| diaphragm | action: contraction expands thoracic cavity, compresses abdominopelvic cavity
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| external oblique | origin: lower eight ribs
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| external oblique | insertion: linea alba and iliac crest
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| external oblique | action: compresses abdomen, depresses ribs, flexes or laterally flexes vertebral column
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| internal oblique | origin: illiac crest and adjacent connective tissues
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| internal oblique | insertion: lower ribs, xiphoid of sternum and linea alba
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| internal oblique | action: compresses abdomen, depresses ribs, flexes or laterally flexes vertebral column
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| transversus abdominis | origin: cartilages of lower ribs, iliac crest, and adjacent connective tissues
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| transversus abdominis | insertion: linea alba and pubis
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| transversus abdominis | action: compresses abdomen
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| rectus abdominis | origin: superior surface of pubis around symphysis
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| rectus abdominis | insertion: inferior surfaces of costal cartilages (ribs 5-7) and xiphoid process
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| rectus abdominis | action: depresses ribs, flexes vertebral column
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Created by:
lizzy.spangler
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