Spinalis

Structure

• Most medial portion of Erector Spinae
• Extends from thoracic spine to cervical spine
• Subsegments
  • Spinalis Thoracis (Spinalis Dorsi)
  • Spinalis Cervicis (Spinalis Colli)
  • Spinalis Capitis (Biventer Cervicis)

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Origin

• Spinous processes of upper lumbar and lower thoracic vertebrae
• Nuchal Ligament
• Spinous process of vertebra C7

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Insertion

• Spinous processes of upper thoracic vertebrae
• Spinous processes of vertebrae C2-C7

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Actions

• Bilateral: Extension of trunk, cervical spine, and head
• Unilateral: Sidebending of trunk, cervical spine, and head to same side

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Vascular Supply

• Occipital Artery (Muscular branches)
• Vertebral Artery (Muscular branches)
• Deep Cervical Artery
• Posterior Intercostal Arteries
• Subcostal Arteries
• Lumbar Arteries
• Lateral Sacral Artery

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Nerve

• Spinal nerves C2-L3 (Dorsal Rami)

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See Also

• Physical Exam Neck
• Neck Anatomy (Main)
• Neck Pain (Main)

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