SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Human skeleton. Computer artwork of an X-ray of the human skeletal system, with the organs of the abdominal cavity. The skeleton provides protection and support, and the joints allow locomotion. The ribs (upper frame) enclose the heart and lungs (not seen). The pelvis (centre) protects the lower abdominal organs, including parts of the colon (yellow, running from centre left to upper left, across to upper right then down to centre). The colon surrounds the coiled small intestine. The humerus (upper arm bone) articulates with the radius and ulna (lower arm bones) at the elbow. The femur (thigh bone) articulates with the fibula and tibia (lower leg bones) at the knee.
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