The infraspinatus is one of those enigmatic rotator cuff muscles. The rotator cuff can be the root of all evil for some people, so this month is dedicated to learning about this troublesome structure and how to keep it healthy.
There are four muscles in the rotator cuff. They are the supraspinatus, infraspinatus, teres minor, and subscapularis. The infraspinatus, which we will focus on today, helps rotate the head of your humerus outward, away from the midline of your body. This is essential for good posture.
The origin of the infraspinatus is on a landmark called the infraspinatus fossa. This is the ridge on the scapula just below its spine. The exact origin is on the medial two-thirds of the scapula’s dorsal surface just below the scapular spine.
Infraspinatus inserts on the posterior aspect (the back) of the greater tubercle of the humerus. The greater tubercle of the humerus is the bony nodule that is further from the midline of your body.
So, this muscle runs below the scapular spine, from the edge of your scapula closer to the midline of your body to the back of the larger notch on your humerus. It fills in the rest of the back surface of your triangle-shaped scapula with the supraspinatus.
The main purpose of the infraspinatus is to laterally rotate the humerus at the shoulder. Lateral rotation, in this case, is when the head of the humerus turns outward, away from the midline of the body. This movement is essential for good posture, but be careful not to overdo it. A little bit of lateral rotation goes a long way, and too much will cause an injury.
Another duty of the infraspinatus is to stabilize the glenohumeral joint. The glenohumeral joint is a fancy name for your shoulder joint, and all rotator cuff muscles contribute to the balance of this joint.
Anyone who has ever torn a rotator cuff muscle will tell you that there are a number of ways to injure these muscles. According to Yoganatomy.com, the infraspinatus is the second most commonly torn rotator cuff muscle. Baseball pitchers also commonly tear this muscle, and you can also injure your infraspinatus if you dislocate your shoulder.
Restoring or Maintaining Health
If you believe that you have injured or torn your infraspinatus, contact your doctor. Your doctor can order the appropriate imaging, therapy, and medicine necessary for your recovery.
However, if you feel like you have a muscle tightness or weakness and are wanting to improve the functionality of this muscle, I have some suggestions.
To strengthen the infraspinatus, practice Side plank. This is both a Pilates exercise and yoga pose. However, only yoga offers really great options for stretching this muscle. Any time you bring your arms behind your back (like for binds or reverse namaste), you’ll find a stretch for the infraspinatus. You also get a stretch in your lower arm during Gomukhasana.
I consultedby Chris Jarmey. Recently, the book was revised and is in its third edition. I love this book as a quick go-to guide for easy to understand anatomy.
For those who are more interested in technical terminology and smaller muscles, I recommend. Any time a client comes to me with pain, I use these flash cards.
Also, I consulted David Keil’s article on the infraspinatus and teres minor at Yoganatomy.com.
What’s your favorite rotator cuff exercise? Let us know in the comments below.
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