Erector Spinae

The erector spinae (sometimes known as sacrospinalis) is often described as a group of different muscles called iliocostalis, longissimus and spinalis. Erector spinae consists of lots of small fibres which are situated very close to the spine.

Origin

  • Posterior crest of the ilium.  
  • Lower posterior surface of the sacrum.  
  • Lower 7 ribs.  
  • Spinous processes of T9-L5.  
  • ransverse processes of T1-12.  

Insertion

  • Angles of the ribs.  
  • Transverse processes of all vertebrae.  
  • Base of the skull.  

Actions

  • Extension of the spine.
  • Lateral flexion (side-bending) of the spine.
  • Maintains correct curvature of the spine.

Innervation

  • Dorsal rami of cervical, thoracic and lumbar spinal nerves.  

Example strengthening exercises

Example stretches

Related injuries

Related muscles