APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Specifically, they facilitate abduction of the arm from 90 degrees and further upwards.

Detailed explanation-2: -Deltoid is the prime mover of shoulder abduction. All heads of the deltoid work together to produce abduction of the Shoulder Joint. It helps lift the arm front, side, and backward. Deltoid pain can affect anyone who does repetitive overhead activities eg house painters, swimmers, Waterpolo players, and pitchers.

Detailed explanation-3: -middle deltoid. The middle deltoid is associated with ONLY shoulder abduction. The deltoid originates from three different heads (points) which are anteriorly, posteriorly and laterally.

Detailed explanation-4: -This makes the deltoid an antagonist muscle of the pectoralis major and latissimus dorsi during arm adduction. The anterior fibers assist the pectoralis major to flex the shoulder. The anterior deltoid also works in tandem with the subscapularis, pecs and lats to internally (medially) rotate the humerus.