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deltoideus muscle
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The Human Body muscles of the neck; human muscle system muscles of the shoulder; human muscle system muscles of the abdominal wall muscles of the back; human muscle system muscles of the upper arm; human muscle system arm muscles human muscular system: posterior view
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deltoideus muscle

anatomy
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deltoideus muscle, large, triangular muscle that covers the shoulder and serves mainly to raise the arm laterally. The deltoid, as it is commonly known, originates on the outer front third of the clavicle (collarbone) and the lower margin of the spine of the scapula (shoulder blade). Its fibres unite to form a thick tendon that inserts at the deltoid tuberosity, a rough spot above the middle of the outer surface of the humerus (upper arm bone).

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Michele Metych.