PHOTO QUEST LTD / SCIENCE PHOTO LIBRARY PHOTO QUEST LTD / SCIENCE PHOTO LIBRARY
Elbow joint. Macro photograph of a longitudinal section through the arm showing the elbow joint. The inside of the elbow is at top. At left is the humerus (upper arm bone) and at right is the ulna (one of the lower arm bones). The heads of the two bones articulate to form the elbow joint. Muscles are red. To the right of the humerus is the biceps muscle and to the left is the triceps muscle. Above the ulna is are the extensor muscles.
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