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.
Basic Function:
To rotate and lift the arm. The anterior deltoid (front) lifts the arm to the front; The medial deltoid (side) lifts the arm to the side; The posterior deltoid (rear) lifts the arm to the rear.
Exercises coming soon...
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