BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Biceps brachii muscles. Artwork showing the biceps muscles (red) of the arm contracted (right) and relaxed (left), including the upper and lower tendons. The biceps brachii of the upper arm consist of two muscle heads. The upper tendons are drawn to show their origin at the level of the shoulder. The lower tendons show the point of insertion at the elbow. The biceps can be used both to flex the elbow, and also to rotate the palms of the hand.
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