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Muscles of the Upper Limb. Definitions: Facet: a small smooth area on a bone or other firm structure. Fossa: a depression usually more or less longitudinal in shape below the level of the surface of a part. Pollicis: the thumb. Tubercle: a nodule.
The major muscles involved in moving the elbow include: 1  Biceps brachii: The large muscle of the upper arm flexes the arm and powerfully twists the forearm, turning the palm upward. 2  Triceps brachii: This muscle at the back of the upper arm extends the arm and stabilizes the elbow when the hand is used for fine movements.