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am the Prime Mover for shoulder (GH) adduction and extension. Who am I? Deltoid

I am a diamond shaped shoulder girdle muscle that retracts and upwardly rotates the scapula. Who am 1?   None of these

My origin is the inferior third of the axillary border of the scapula and my insertion is the medial lip of the bicipital groove. Who am I? Teres Major

I am the most powerful shoulder ABDuctor in the body. Who am I? None of these

I am the muscle that is MOST responsible for stability of the GH joint. Who am 1? All of these

When palpating the spinous processes of the vertebrae, my origin is the most inferior. Who am I? Lattissimus Dorsi

I function to flex the shoulder while supinating the forearm. Who am I? Long head of the Triceps

All of the following insert into the greater tubercle expect for me. Who am I? Teres Minor

This is me. Who am I? Pectoralis Minor

I am a shoulder mover that is synergistic and antagonistic to myself. Who am I? Pectoralis Major