Rectus Abdominis - Muscle Physiology & Functional Anatomy


Rectus Abdominis Muscle






  • Crest of pubis


  • Costal cartilage of ribs 5-7 & the xiphoid process of sternum

Major Arteries:

  • Inferior epigastric artery


Neural Innervation:

  • Segmentally by thoraco-abdominal nerves (T7-T12)


Trigger Points:

Rectus Abdominis Trigger PointsRectus Abdominis Trigger Points





Concentric Functions:

  • Lumbar flexion of the spine


Eccentric Functions:

  • Decelerates extension & rotation of the spine


Isometric Function:

  • Stabilizes the lumbo-pelvic-hip complex


Related Muscles







More Images of the Rectus Abdominis Muscle


Rectus Abdominis



More Information about the Rectus Abdominis Muscle

A weak rectus abdominis muscle can cause problems with certain exercises and increase the risk of lower back injury.  When the rectus abdminis is weak the antagonists, the erector spinae muscles have to bear more forces which puts the low back at risk of injury along with the fact that they are allowed to hyperextend further as well.



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