Yes , deltoid muscles is the prime mover for shoulder abduction.
Explanation:
Deltoid muscles also involves in the shoulder flexion, extension,medial and lateral rotation.
Deltoid muscles located at shoulder region,where it is triangular form of muscles.
It has three parts namely anterior, middle posterior portion of deltoid muscles.each one provide specific action in the shoulder region.
Middle deltoid muscles produce action as abduction of arm.
Anterior deltoid produce action as flex and rotate the shoulder.
Deltoid muscles get arises from spine of scapula, clavicle(lateral part) and acromion process and it get inserted on the deltoid tuberosity in the humerus bone.
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