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Serratus Anterior Origin, Insertion, Action, Innervation

(Last Updated On: August 10, 2018)
Serratus Anterior Origin, Insertion, Action

Muscle Anatomy of the Serratus Anterior

Origin: Iliolumbar ligaments and the iliac crest
Insertion: Inferior border of the 12th rib and the transverse processes of L1, L2, L3, L4 vertebra
Actions: Unilaterally: Lateral flexion of the spine, elevation of the pelvis
Bilaterally: Depresses the 12th rib at the costospinal joints
Innervation: Ventral Primary rami of (T7 to T12)
Blood Supply: Lumbar branch of the iliolumbar artery

Muscle Anatomy: Serratus Anterior Actions

Primary Actions of the Serratus Anterior

1.  Upward rotation of the scapula

  Agonists:

  • Trapezius

  Antagonists:

  • Levator Scapulae
  • Serratus Anterior (upper fibers)
  • Rhomboid Major
  • Rhomboid Minor
  • Pectoralis Minor

2. Downward rotation of the scapula

  Agonists:

  • Levator Scapulae
  • Rhomboid Major
  • Rhomboid Minor
  • Pectoralis Minor
  • Trapezius (middle fibers)
  • Serratus Anterior (lower part)

  Antagonists: 

  • Trapezius (upper and lower fibers)
  • Serratus Anterior (lower fibers)
  • Stabilizer: Trapezius

3. Protraction of the scapula

  Agonists: 

  • Pectoralis Minor

  Antagonists:

  • Trapezius (middle fibers)
  • Rhomboids Major
  • Rhomboid Minor

4. Depression of the scapula

  Agonists: 

  • Pectoralis Minor
  • Trapezius (lower fibers)

  Antagonists:

  • Trapezius (upper part)
  • Levator Scapulae

5. Stabilizes the medial border of the scapula to the chest wall during movement of the arm at the shoulder

Information about cause and effect of Serratus Anterior pain:

Serratus Anterior Pain and Symptoms

Recommended Anatomy Books:

Anatomy Coloring Book

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 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.

Human Muscle Anatomy

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 lay person who wants to gain understanding of the muscle, skeletal system and how our bodies move. This book will not disappoint!

Basic Clinical Massage Therapy

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 recommended treatments for each muscle.

Muscle Anatomy Flashcards

Musculoskeletal Anatomy Flashcards Are you a student or professional therapist who needs to brush up on the musculoskeletal system? Dr. Joseph E. Muscolino DC has developed a comprehensive set of flashcards that will help develop a mind's picture of exactly where the muscles lie under the skin. A highly recommended study aid for students. Great for non students who want an easy comprehensive anatomy guide.

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