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Iliocostalis Lumborum Anatomy: Origin, Insertion, Actions, Innervation

Iliocostalis Lumborum Anatomy

liocostalis Lumborum AnatomyOrigin: The iliolumbar fascia, the posterior medial lip of the iliac crest, the lateral crest of the sacrum, and the spinous processes of T11 to L5

Insertion: Inferior borders of the angles of the lower six or seven ribs.
Action: Extension of the thoracic spine, lateral flexion of the thoracic spine, extension of the lumbar spine, lateral flexion of the lumbar spine
Innervation: Dorsal primary rami of T11 to L5
Blood Supply: Dorsal rami of the posterior intercostal arteries, the dorsal branches of the subcostal arteries, and the dorsal branches of the lumbar arteries

 

 

Primary Actions of the Iliocostalis Lumborum:

1. Extension of the thoracic spine when acting bilaterally

  • Agonists: Iliocostalis Cervicis, Iliocostalis Thoracis, Longissimus Cervicis, Longissimus Thoracis, Semispinalis Cervicis, Semispinalis Thoracis
  • Antagonists: Rectus abdominis

2. Lateral flexion of the thoracic spine when acting unilaterally

  • Agonists: Iliocostalis Cervicis, Iliocostalis Thoracis,  Longissimus Cervicis, External Oblique, Internal Oblique
  • Antagonists: Iliocostalis Cervicis, Iliocostalis Thoracis, Iliocostalis Lumborum, Longissimus Cervicis, External Oblique, Internal Oblique on the opposite side

3. Extension of the lumbar spine when acting bilaterally

  • Agonists: Longissimus Thoracis, Spinalis Thoracis
  • Antagonists: Rectus abdominis

4. Lateral flexion of the lumbar spine when acting unilaterally

  • Agonists: Longissimus Thoracis, Psoas Major, Quadratus Lumborum, External Oblique, Internal Oblique
  • Antagonists: Longissimus Thoracis, Psoas Major, Quadratus Lumborum, External Oblique, Internal Oblique on the opposite side

For More Information: Iliocostalis Lumborum Muscle: Low Back and Buttock Pain


Recommended Anatomy Books

Trail Guide To  The BodyThe Trail Guide To The Body is another excellent book to help you learn the musculature of the human body. Though the book is geared toward massage therapists and physical therapist assistants, the book with its illustrations and text helps anyone gain a thorough understanding of the human musculoskeletal system and movement. I highly recommend this book to anyone studying anatomy and believe that MTs, PTAs, and teachers of body movements should have this book in their possession. I also highly recommend this book for the lay person who wants to gain understanding of the muscle, skeletal system and how our bodies move.  This book will not disappoint!
References:

The Trigger Point Therapy Workbook – Claire Davies, Amber Davies, and David G. Simons

Basic Clinical Massage Therapy: Integrating Anatomy and Treatment – James H. Clay and David M. Pounds

Trigger Point Therapy for Myofascial Pain – Donna Finando and Steven Finando

Massage Therapy Principles and Practice – Susan Salvo

Theory & Practice of Therapeutic Massage – Mark Beck

 

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