The supraspinatus is a relatively small muscle of the upper back. It is located on the superior part of the scapula, just above the scapula spine which is a prominent bone plate on the shoulder blade. You can place your fingers on your shoulder blade then poke around until you find a thin bony part (scapula spine) that sticks out and runs horizontally. Let your fingers slide upwards off this bony part and you will have your fingers on the supraspinatus.

The supraspinatus acts to abduct the shoulder joint. The most common problem that occurs with the supraspinatus is "Shoulder Impingement Syndrome" which is commonly seen in weightlifters, swimmers, and baseball pitchers. People in the gym who do upright rows and lateral raises with their elbows above their shoulders are most likely to develop shoulder impingement.