Infraspinatus Muscle

There is another muscle over here and that is the infraspinatus muscle.

Now, infraspinatus muscle has its origin below the spine of the scapula.

That’s why it’s called the infraspinatus muscle.

Now, the infraspinatus muscle does not attach from above over here, but it attaches somewhat from the side over here.

So once this muscle contracts, it normally performs the external rotation of the arm.

That is basically this movement.