Iliocostalis

Description

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

The erector spinae muscles

Name

• Iliocostalis
• Iliocostalis Lumborum

General

• Most lateral portion of Erector Spinae
• Extends from sacrum to cervical spine
• Subsegments
  • Iliocostalis Lumborum (Sacrolumbalis)
  • Iliocostalis Thoracis (Iliocostalis Dorsi)
  • Iliocostalis Cervicis (Cervicalis Ascendens)

Origin

• Sacrum
• Iliac Crest
• Spinous process of lumbar vertebrae and thoracic vertebrae T11-T12
• Angle of ribs

Insertion

• Rib angles
• Transverse process of vertebrae C4-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)
• Deep Cervical Artery
• Posterior Intercostal Arteries
• Subcostal Arteries
• Lumbar Arteries
• Lateral Sacral Artery

Innervation

• Spinal nerves C4-S5 (Dorsal Rami)

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Clinical Significance

• Myofascial Pain Syndrome
• Pisa Syndrome (Parkinson's Disease)

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See Also

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

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