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4 terms

Muscles of the Trunk

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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