Rectus Abdominis - Muscle Physiology & Functional Anatomy

 

Rectus Abdominis Muscle

 

 

Anatomy

 

Origin:

  • Crest of pubis

Insertion:

  • 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

 

 

Physiology

 

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

 

Antagonist

 

Exercises:

 

 


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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