Deltoid muscle

The deltoid muscle is the triangular muscle that covers the upper arm and shoulder joint. It moves the upper arm forward, backward, to the side, and away from the body.

Last Updated: September 23, 2009

Author: Shannon Erstad, MBA/MPH

Medical Review: William M. Green, MD - Emergency Medicine & Kenneth J. Koval, MD - Orthopedic Surgery, Orthopedic Trauma & Patrick J. McMahon, MD - Orthopedics

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