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(Last Updated On: March 11, 2019)

Pectoralis Minor Origin, Insertion, Actions

Muscle Anatomy of the Pectoralis Minor

Origin: Anterior surfaces of the third to fifth ribs
Insertion: Via a tendon to the medial aspect of the coracoid process of the scapula. Part or all of the tendon may transverse this process and continue into the coracoacromial ligament
Actions: Scapula protraction, depression of the scapula
Innervation: Medial pectoral nerve (C7, T1)
Blood Supply: Branches from the thoraco-acromial artery

Pectoralis Minor Origin, Insertion, Action, Innervation

Pectoralis Minor Actions With Agonists and Antagonists

Primary Actions of the Pectoralis Minor

1. Protraction of the scapula

Agonists:

  • Serratus Anterior

Antagonists:

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

2. Depression of the scapula

Agonists:

  • Serratus Anterior (lower part)
  • Trapezius (lower part)

Antagonists: 

  • Trapezius (upper part)
  • Levator scapulae

Secondary Actions of the Pectoralis Minor:

1. Assists with downward rotation of the scapula

Agonists:

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

Antagonists: 

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

Information about cause and effect of Pectoralis Minor pain:

Pectoralis Minor Pain and Symptoms

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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.

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!

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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