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Rectus abdominis
Origin, insertion, function
Origin: pubic crest & symphysis
Insertion: xyphoid process; costal cartilages of ribs 5-7
Function: Flexes and rotates vertebral column; compresses abdominal wall
External oblique
Unilateral – rotates and laterally flexes vertebral column to same side
Bilateral – flexes vertebral column and compresses abdominal wall
Internal oblique
function: Unilateral – rotates and laterally flexes vertebral column to same side
Bilateral – flexes vertebral column and compresses abdominal wall
Transversus abdominis
Function: Compresses abdominal wall