(1) Deltoid: The deltoid is a large, three - headed, thick,
triangular muscle which originates from the clavicle and the
scapula at the rear of the shoulder and extends down to its
insertion in the upper arm.
Function: To rotate and lift the arm. The anterior deltoid
lifts the arm to the front; the medial deltoid lifts the arm to the
side; the posterior deltoid lifts the arm to the rear.
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