Follow and Like Us:

Infraspinatus Muscle Anatomy: Origin, Insertion, Action

Infraspinatus Muscle Anatomy Study

Infraspinatus Muscle Anatomy
Origin: Infraspinous fossa of the scapula
Insertion: Middle facet of greater tubercle of the humerus
Action: External rotation of arm, stabilizes humerus
Innervation: Suprascapular Nerve (C5, 6)
Blood Supply: Suprascapular Artery and circumflex humeral arter from the axillary artery.

Synergist: Deltoid, Supraspinatus, Teres major, Teres minor, Subscapularis.

Antagonist: Pectoralis major, Pectoralis minor, Subclavius, Serratus anterior, Latissimus dorsi, Trapezius, Rhomboid major, Rhomboid minor, Levator scapulae

For Pain and Symptom Information See: Infraspinatus Muscle  Pain and Symptoms


Primary Actions of the Infraspinatus Muscle:

1. External rotation of the shoulder

  • Agonists: Teres Minor, Deltoid (posterior fibers)
  • Antagonists: Subscapularis, Deltoid (anterior fibers), Latissimus Dorsi, Pectoralis Major (clavicular head, Teres Major

Secondary Actions of the Infraspinatus:

1. Assists with depression of the humeral head

  • Agonists: Teres Minor, Subscapularis


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 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.

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.

Trail Guide To The Body


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!



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


Leave a Comment