The Infraspinatus Muscle Explained

Description: The subscapularis is a triangular muscle that covers the inner surface of the scapulae (shoulder blade) from behind.

Role: This muscle rotates the arm outwards, and acts as a necessary stabilizer in the back of the scapulae to align the shoulder joint.

Since the infraspinatus muscle is almost the only external rotator of the shoulder, its optimal strength is crucial for healthy balance and function of the entire shoulder. 

Potential damage: Infraspinatus weakness will cause the humeral head of the shoulder joint to move forward. Such misalignment of the shoulder can often overload the subscapularis muscle and will cause gradual tendinopathy, which means gradual wear or even a tear of it. Furthermore, a forward movement of the 

shoulder joint may cause irritation of nerves as they pass through to the muscles in the upper limbs. 

Exercise: Training this muscle can be done with a resistance band, with both shoulders aligned and slightly pulled backward. Lift one arm sideways at 90 degrees to the body, with the elbow bent at 90 degrees also. 

Rotate the arm backward whilst pulling on the resistance band. This muscle is rather flat and wide, therefore it requires little resistance to activate it to get it and get it stronger.

Exercising Inraspinatus: the motion striating point

Exercising Inraspinatus: the end of of motion point

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