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Knee bones and ligaments. Historical anatomical artwork of knee bones (yellow) and ligaments (pale blue). Ligaments are bands of fibrous tissue that hold bones together at joints. An undissected knee is seen from four sides: front (upper left); back (upper right); outer side (centre left); and inner side (centre right). Ligaments obscure the kneecap (patella). The knee (frontal view) is increasingly dissected by removing the synovial membrane (upper centre) and the patella (lower left). The floor of the knee joint (from above) is at lower centre. A vertical section through the knee is at lower right. Artwork from The Bones and Ligaments of the Human Body (Ed. Jones Quain, London, 1842). (KEYSTONE/SCIENCE PHOTO LIBRARY/SHEILA TERRY) === ===