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The deltoid is a triangular shoulder muscle that defines the arm’s connection to the torso. Composed of three sections—anterior, lateral (or middle), and posterior—it shapes the shoulder’s contour and shifts visibly with arm movement. This muscle covers the front, side, and back of the shoulder joint, playing a crucial role in shoulder mobility and strength.
The deltoid’s proximal attachment is U-shaped, resembling the distal insertion of the trapezius muscle. Artists often emphasize the deltoid to convey strength, width, and motion in the upper body, as its dynamic changes enhance the realism of the figure.
| Origin |
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| Insertion | Deltoid tuberosity |
| Actions |
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| Abbreviation | DT |
