Erector Spinae Muscles

Description

Iliocostalis

• Origin: Sacrum, Iliac Crest, spinous processes of lower lumbar, thoracic Vertebrae
• Insertion: Ribs

Longissimus

• Origin: Transverse Process
• Insertion: Transverse Process

Spinalis

• Origin:
  • Thoracis: Spinous process of upper lumbar and lower thoracic Vertebrae
  • Cervicis: Nuchal Ligament, spinous process of C7 Vertebrae
• Insertion
  • Thoracis: Spinous process of upper thoracic Vertebrae
  • Cervicis: Spinous process of cervical Vertebrae except atlas

---

Actions

• Unilaterally: laterally flex the head, neck and vertebral column to the same side
• Bilaterally: Extend the vertebral column.

---

Vascular Supply

• Lateral sacral artery
• Intercostal and lumbar arteries

---

Innervation

• Posterior branch of spinal nerve

---

---

See Also

• Back Anatomy (Main)
• Back Pain (Main)

---

---