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External oblique
Origin: Ribs 5-12
Insetion: Iliac crest, linea alba
Action: Compresses abdomen, depresses ribs, flexes spine
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Internal oblique
Origin: Iliac crest and thoracolumbar fascia
Insetion: Linea alba, xiphoid process, inferior ribs
Action: Extends vertebral column and rotates toward opposite side
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Transverse abdominis
Origin: Iliac crest, thoacolumbar fascia and catilages of ribs 6-12
Insetion: Linea alba, pubis
Action: Compresses abdomen
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Pyramidilis
Origin: Pubic crest anterior to origin of rectus abdominis
Insetion: Lower linea alba
Action: Reinforces lower rectus sheath
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External intercostals
Origin: Inferior border of each rib
Insetion: Superior border of rib below
Action: Elevates ribs
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Internal intercostals
Origin: Superior border of each rib
Insetion: Inferior border of rib above
Action: Depresses ribs
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