Serratus Posterior Inferior Origin, Insertion, Action

Muscle Anatomy of the Serratus Posterior Inferior

Origin: The spinous processes of the T11 to L2/L3 and their corresponding supraspinous ligaments, blending with the lumbar part of the thoracolumbar fascia
Insertion: Inferior borders and outer surfaces of the lower four ribs (9th -12th), lateral to their angles
Actions: Forced expiration
Innervation: Ventral primary rami of T9 – T12
Blood Supply: Dorsal branches of the subcostal arteries Serratus Posterior Inferior Origin, Insertion, Action, Innervation

Serratus Posterior Inferior Actions

Primary Actions of the Serratus Posterior Inferior

1. Forced expiration


  • Transversus abdominis
  • Serratus posterior superior
  • Levatores costarum brevis
  • Levatores costarum longi

Information about cause and effect of Serratus Posterior Inferior pain:

Serratus Posterior Inferior Muscle: Mid to Low Back Pain

Recommended Anatomy Books:

The Anatomy Coloring Book is one of the best study and reference books for beginning anatomy students. The diagrams are clearly labeled and allow you to see the relationship and placement of the various structures of the body. You will also be surprised by how the act of coloring will help with recall. But this is not just a beginners book, it is also great for practitioners and therapists to have on hand to use with clients and patients to use as a visual reference.

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The 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 for 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 layperson who wants to gain an understanding of the muscle, skeletal system and how our bodies move. This book will not disappoint!

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Out of the scores of books in my office, Basic Clinical Massage Therapy is by far the most referenced book in my library. The musculoskeletal system is overlaid on human models allowing you to learn the precise location, origin, and insertions of each muscle. The models are pictured in various poses throughout the book which also helps you visualize muscles in motion and their actions relationship with the skeletal structure and other muscles. Though it is written for massage therapists, it is an excellent book for anyone who wants to learn about the muscular system. MT’s will benefit from the recommended treatments for each muscle.

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