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Other Terms: Antebrachium, Arm
There are twenty muscles in the antebrachium, eight in the anterior compartment and twelve in the posterior compartment. This varied array of muscles has a wide range of structure and function. Some are long slender muscles that cross multiple joints, while others are short flat muscles that cross only a single joint. As a group, they produce actions at the elbow joint, the wrist joint, and the various joints of the fingers and thumb. These actions range from powerful grasping motions to intricate, detailed movements of the fingers. All of the muscles are innervated by one of three nerves – the radial, the ulnar, or the median nerves. The radial and ulnar arteries supply blood to these muscles.