Spinalis Muscle

Description

Spinalis

Deep spinal muscles including semispinalis, multifidus, spinalis, longissimus, iliocostalis

Name

• Spinalis
• Ribeye cap
• Sacrospinalis
• Spinalis Muscle Group
• Spinalis Thoracis
• Spinalis Cervicis
• Spinalis Capitis
• Medial Erector Spinae Muscle
• Erector Spinae – Spinalis Division

General

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

Origin

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

Insertion

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

Actions

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

Vascular Supply

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

Innervation

• Spinal nerves C2-L3 (Dorsal Rami)

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Clinical Significance

Pathology

• Mechanical Back Pain
• Chronic Back Pain

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See Also

Cervical

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

Thoracolumbar

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

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