Erector Spinae

Musculi erector spinae

Core CoreBackSpinal ErectorsPosterior Chain

The erector spinae is a group of three muscle columns (iliocostalis, longissimus, spinalis) running either side of the spine from the sacrum to the skull. They extend and laterally flex the spine and, just as importantly, resist flexion to keep the trunk rigid under load. They are heavily trained by deadlifts, good mornings, back extensions, and any braced hinge, and are central to posterior-chain and spinal-stability strength.

Actions

Spinal extension, Lateral flexion of the trunk (unilateral), Trunk rotation (unilateral), Controls flexion eccentrically, Maintains upright posture

Origin

Common tendon from the sacrum, iliac crest, spinous processes of lumbar and lower thoracic vertebrae, and supraspinous ligament

Insertion

Ribs, transverse and spinous processes of thoracic and cervical vertebrae, and mastoid process of the temporal bone

Innervation

Posterior rami of spinal nerves (segmental)

Blood supply

Posterior intercostal, subcostal, lumbar, and lateral sacral arteries

Heads

Iliocostalis, Longissimus, Spinalis

Wikipedia ↗

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