Muscles that act on abdominal wall

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Author:
wvuong
ID:
214458
Filename:
Muscles that act on abdominal wall
Updated:
2014-07-16 18:04:07
Tags:
muscles
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O, I, and A
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  1. Rectus abdominis
    origin
    pubic crest and symphsis
  2. rectus abdominis 
    insertion
    xiphoid process and costal cartilages of ribs 5-7
  3. rectus abdominis
    action
    • flex and rotate lumbar region of vertebral column; 
    • fix and depress ribs, stabilize pelvis during walking, increase intra-abdominal pressure; 
    • used in sit-up curls
  4. external oblique 
    origin
    by fleshy strips from outer surfaces of lower 8 ribs
  5. external oblique
    insertion
    • most fibers insert into linea alba via a broad aponeurosis;
    • some insert into pubic crest and tubercle and iliac crest
  6. external oblique
    action
    • when pair contract simultaneously, flex vertebral column and compress abdominal wall and increase intra-abdominal pressure; 
    • acting individually, aid muscles of back in rotating trunk and flexing laterally;
    • used in oblique curls
  7. internal oblique 
    origin
    lumbar fascia, iliac crest, and inguinal ligament
  8. internal oblique 
    insertion
    linea alba, pubic crst, last three or four ribs, and costal margin
  9. internal oblique
    action
    as for external oblique
  10. transverses abdominis
    origin
    • inguinal ligament, lumbar fascial, cartilages of last 6 ribs;
    • iliac crest
  11. transverse abdominis
    insertion
    linea alba, pubic crest
  12. transverses abdominis 
    action
    compresses abdominal contents

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