DAVID GIFFORD / SCIENCE PHOTO LIBRARY DAVID GIFFORD / SCIENCE PHOTO LIBRARY
Skeleton. Computer illustration based on an X-ray of a healthy human skeleton. Bones of the skeleton provide protection and support, and their joints allow locomotion. The skull (at top) protects the brain. The ribs of the chest (at upper centre) enclose the heart and lungs. The pelvis (at centre) protects the lower abdominal organs. The spine, running from the skull to the pelvis, surrounds the spinal column. Long bones provide support and make up the arms and legs. The humerus (upper-arm bone), from the shoulder, articulates with the radius and ulna at the elbow. Similarly, the femur (thigh-bone), from the pelvis, articulates with the fibula and tibia at the knee.
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