You are performing a manual muscle test on a patient seconda…
You are performing a manual muscle test on a patient secondary to weakness in the UE. You are attempting to evaluate the status of the patient’s shoulder complex musculature. The patient is positioned prone with the shoulder in 90 degrees of abduction and the elbow flexed to a right angle with the forearm hanging down over the side. The physical therapist assistant asks the patient to lift his arm up toward the ceiling and then provides pressure against the suspended arm that will exert a downward force. He instructs the patient to focus on holding her shoulder blade in place while he applies resistance. Based on this information, which of the following muscles is the therapist most likely testing?