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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

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