Erector Spinae – Essentials

Actions

• Extends spine
• Maintains erect posture
• Laterally flexes spine
• Rotates spine

Origin

• Slips of muscle rising from the medial sacral crest, iliac crest, ribs
• Spines of T₁₁ to L₅
• Supraspinous ligament
• Iliac crest

Insertion

• Transverse and spinous processes of thoracic and cervical vertebrae
• Occipital bones

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