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What Are the Muscles of Your Arms? There are four main muscles of your arms: biceps, triceps, forearm flexors, and forearm extensors. There are also a handful of other muscles that support these main four.
The human arm is divided into two main regions, the portion from the elbow to the wrist known as the forearm, and the segment from the shoulder to the elbow referred to as the arm. Arm muscle anatomy enables the arm to perform a variety of movements, including flexion, extension, pronation, and supination.