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 - Dorsal raises.
Example stretches - Back arch stretch.