Bone anatomy. 18th-century illustration of several bones cut open to show their inner spongy texture. These include a clavicle (collar bone), and pelvis, leg and arm bones. This illustration is from 'Osteographia, or the Anatomy of the bones' (London, 1733) by English surgeon and anatomist William Cheselden (1688-1752). It was the first full and accurate description of the anatomy of the human skeletal system.