Figure showing the anatomical markers used to identify the deltoid injection site. The deltoid is a large rounded triangular shape on the outside of the upper arm, on top of the humerus, the clavicle and the scapula. The brachial artery and the radial nerve sit behind the deltoid and come down from the muscle. The injection site is a smaller triangle-shaped area, in the middle of the deltoid, above the deltoid tuberosity.
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