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Rectus Abdominus
o = superior surface of pubis near symphysis
i = inferor surfaces of costal cartilages and xiphoid process
a = depresses ribs, flexes vertebral column
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external oblique
o = external surfaces of lower 8 ribs
i = linea alba, exterior half of iliac crest
a = compresses abdominopelvic cavity, flixing and rotating vertebral column
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internal oblique
o = iliac cres, lumbodorsal ligament
i = linea alba, pubic crest, lower 4 ribs
a = compresses abdomino pelvic cavity, assists in flexing and rotating vertebral column
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transversus abdominus
o = iliac crest, costal cartilage of lower 6 ribs
i = linea alba and pubic crest
a = compresses abdominopelvic cavity
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diaphragm
o = xipoid process
i = central tendon of diaphragm
a = increases volume of thoracic cavity
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