JOHN DAUGHERTY / SCIENCE PHOTO LIBRARY JOHN DAUGHERTY / SCIENCE PHOTO LIBRARY
Human skeleton. Artwork of a male skeleton with muscles also revealed. The skeleton's 206 bones provide protection and support, while their joints allow locomotion. The skull (top) protects the brain. The ribs of the chest (upper centre) enclose the heart and lungs. The pelvis (centre) protects the lower abdominal organs. The spine, running from the skull to the pelvis, surrounds the spinal cord. Long bones provide support and make up the arms and legs. The humerus (upper-arm bone) articulates with the radius and ulna at the elbow. The femur (thigh bone) from the pelvis articulates with the tibia and fibula at the knee.
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