The Infraspinatus Muscle: Functions, Movements, and Strengthening Exercises for Shoulder Stability

Bottom layer muscle on the scapula.

The bottom layer muscle on the scapula is known as the infraspinatus muscle

The bottom layer muscle on the scapula is known as the infraspinatus muscle.

The infraspinatus muscle is one of the four muscles that make up the rotator cuff in the shoulder joint. It is located on the posterior (back) side of the scapula and attaches to the greater tubercle of the humerus (upper arm bone). This muscle plays a crucial role in the stability and movement of the shoulder joint.

The main function of the infraspinatus muscle is to externally rotate the arm. This means it helps to rotate the upper arm away from the body, allowing you to reach your arm out to the side and rotate it externally. It also assists in stabilizing the shoulder joint during arm movements, reducing the risk of dislocation or injury.

In addition to external rotation, the infraspinatus muscle also contributes to other shoulder movements, including extension (moving the arm backward), horizontal abduction (moving the arm away from the midline of the body), and adduction (bringing the arm back towards the midline of the body).

To strengthen the infraspinatus muscle, exercises such as external rotation with resistance bands or dumbbells can be performed. It is important to note that before starting any exercise routine or if you are experiencing shoulder pain or discomfort, it is advisable to consult with a healthcare professional or a certified trainer to ensure proper form and technique.

In summary, the infraspinatus muscle is an important muscle located on the backside of the scapula. It contributes to the stability and movement of the shoulder joint, particularly in external rotation of the arm. Strengthening exercises for this muscle can help improve shoulder strength and stability.

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