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Rectus Abdominis

Origin- Pubic crest and symphysis pubis
Insertion- Xiphoid process, 5th and 7th ribs
Action- Flexes vertebral column

External Oblique

Origin- Lower 8 ribs
Insertion- Iliac Crest and linea alba
Action- Compresses abdomen; lateral rotation

Internal Oblique

Origin- Iliac Crest
Insertion- linea alba
Action- Compresses abdomen; lateral rotation

Transversus Abdominis

Origin- Iliac crest
Insertion- Xiphoid process, linea alba, pubis
Action- Compresses abdomen

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