Erector Spinae Muscle Group - Anatomy & Physiology

 

Erector Spinae Muscle

 

Anatomy

 

Origin:

  • Iliocastalis
    • Lower posterior surface of the sacrum & posterior ribs
  • Longissimus
    • Transverse processes of lumbar & thoracic vertebrae
  • Spinalis
    • Transverse processes of thoracic & cervical vertebrae & ligamentum nuchae (posterior neck ligaments)


Insertion:

  • Iliocastalis
    • Transverse processes of the cervical vertebrae & posterior ribs
  • Longissimus
    • Transverse processes of the cervical & throacic vertebrae & the mastoid process of the skull
  • Spinalis
    • Spinous processes of the thoracic & cervical vertebrae & the occipital bone of the skull



Major Arteries:

  • Iliocastalis
    • Intercostal arteries
    • Lumbar arteries
  • Longissimus
    • Lateral sacral artery
  • Spinalis
    • Lateral sacral artery

 

Neural Innervation:

  • Iliocastalis
    • Posterior branch of spinal nerve
  • Longissimus
    • Posterior branch of spinal nerve
  • Spinalis
    • Posterior branch of spinal nerve

 

Trigger Points:

Erector Spinae Trigger Points of the Longissimus thoracisTrigger Points for the Iliocostalis thoracis

Trigger Points for Iliocostalis thoracis of Erecor Spinae

 

Trigger points for the Semispinalis cervicisTrigger points for Semispinalis capitis of Erector Spinae Muscle Group

 

 

Physiology

 

Concentric Functions:

  • Iliocastalis
    •  
    • Lateral flexion of the (thoracic, lumbar & cervical) spine
    • Rotation of the  (thoracic, lumbar & cervical) spine
  • Longissimus
    • Extension of the (thoracic, lumbar & cervical) spine
    • Lateral flexion of the (cervical) spine
    • Rotation of the (cervical) spine
  • Spinalis
    • Extension of the (thoracic, lumbar & cervical) spine

 

Eccentric Functions:

  • Decelerates flexion, rotation and lateral flexion of the spine

 

Isometric Function:

  • Dynamically stabilizes the spine during functional movements

 

Related Muscles:

 

Antagonist:

 

Exercises:

 

 

 


More Images of the Erector Spinae Muscle

 

Erector Spinae Muscle


More Information about the Erector Spinae Muscle

The erector spinae muscle group is a bundle of paired bundle of muscles & tendons that run more or less vertically, extending throughout the lumbar, thoracic & cervical regions of the spine.  For classification purposes, each of the erector spinae muscles are divided in sections which the lumborum, thoracis, cervicis & capitis.

 

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