Deltoid
supraspinatus
The deltoid is the prime mover in shoulder abduction. It's two antagonists are the pectoralis major and the latissimus dorsi.
Abductor muscles are the muscles which cause abduction. prime example being lateral head of the shoulder abducts your arms to the side of your body. similarly you have the muscles in your lower body which abducts your legs to the sides.
Shoulder adductors. Abduction means moving away from the median plane of the body and adduction means moving towards the median plane of the body.
There are actually four muscles which make up the shoulder adductors. These muscles include the Pectoralis Major, Coracobrachialis, Latissimus Dorsi, and Teres Major.
The plural of abductor is abductors.
Abduction
The abductor magnus does not exist. It is likely a mistake referring to the aDDuctor magnus.
Its in the groin.
An abductor is either one who abducts or kidnaps another, or a muscle which draws out from a central point.
Abductor muscles pull a limb away from the midline of the body e.g. abductor muscles pull