ROC5892725: Six studies of the bones and muscles of the arm, c.1508-10 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5892736: Recto: The muscles of the leg, c.1510-11 (black chalk, pen & ink, wash on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5455482: The bone and vessels of the thigh, c.1508-10 (pen & ink and chalk on paper) (verso of 5455481), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

MEV5045306: Codex Atlanticus, sheet 69 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

MEV5046882: Codex Atlanticus, sheet 845 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

MEV5046685: Codex Atlanticus, sheet 747 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

MEV5047357: Codex Atlanticus, sheet 1082 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

MEV5045710: Codex Atlanticus, sheet 264 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

ROC489435: The Leg Sectioned, c.1485 (pen & ink over metalpoint on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5674283: Recto: The torso and leg of a nude man in profile, and a study of machinery, c.1488-90 (pen & ink over traces of black chalk on paper) (recto of 5674284), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XBP341805: A page from the Codex Leicester, 1508-12 (sepia ink on linen paper), Vinci, Leonardo da (1452-1519) / Private Collection / Bridgeman Images

LRI4635228: Geometry: “” An Icosahedron”” Page taken from the manuscript “” De divina proportione”” (On divine proportions) by mathematician Fra Luca Pacioli dit Luca di Borgo (1445-1517) illustrated by Leonardo da Vinci (1452-1519).1509., Vinci, Leonardo da (1452-1519) / Private Collection / Bridgeman Images

ROC412170: Studies of flowing water, c.1510-13 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC437790: The principal organs and vessels of a woman, c.1510 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XIR159289: Study of an Angel (chalk on paper) (b/w photo), Vinci, Leonardo da (1452-1519) (attr.to) / Ecole Nationale Superieure des Beaux-Arts, Paris, France / Bridgeman Images

ROC443652: A portrait of Leonardo, a head of a man, and horse' fore-leg, c.1517-18 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) (studio of) / Royal Collection Trust / Bridgeman Images

XOT405720: The Baptism of Christ by John the Baptist, c.1475 (oil on panel) (detail of 362326), Verrocchio, Andrea (1435-88) & Vinci, Leonardo da(1452-1519) / Galleria degli Uffizi, Florence, Tuscany, Italy / Bridgeman Images

XBP340120: A page from the Codex Leicester, 1508-12 (sepia ink on linen paper), Vinci, Leonardo da (1452-1519) / Private Collection / Bridgeman Images

ROC5892739: Verso: The muscles of the upper spine, c.1510-11 (black chalk, pen & ink, wash on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5617349: A rockfall in a mountainous landscape, c.1512-18 (chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

RTR5315959: Virile head of profile crowned with laurel, c. 1506-10 (blood with contours recrossed in pen on white paper), Vinci, Leonardo da (1452-1519) / Biblioteca Reale, Musei Reali, Turin, Piedmont, Italy / Bridgeman Images

MEV5045393: Codex Atlanticus, sheet 105 verso, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

MEV5046125: Codex Atlanticus, sheet 471 verso, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

ROC5863690: Recto: The muscles of the back and arm, c.1508 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5892737: Verso: The muscles of the trunk and leg, c.1510-11 (black chalk, pen and ink, wash on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5892749: Verso: The brachial plexus and nerves of the arm, c.1508 (pen & ink over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5894042: Verso: Studies of the nervous system, c.1485-90 (metalpoint (faded) and pen and ink on blue-grey prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5669154: A satire on aged lovers, c.1490 (leadpoint, pen & pale ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5669158: Recto: The veins of the face, and a torso, 1489 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3823042: Recto: The proportions of the arm, c.1490 (pen & ink on paper) (recto of 3823043), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC700105: A bear's foot, c.1488-90 (metalpoint and pen & ink with white heightening on blue paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XKH179072: Caricature Head Study of an Old Man, c.1500-05 (red chalk on paper), Vinci, Leonardo da (1452-1519) / Hamburger Kunsthalle, Hamburg, Germany / Bridgeman Images

BIF267170: Architectural sketch for an 'Ideal City', fol. 16 (recto) from Paris Manuscript B, 1488-90 (pen and ink on paper), Vinci, Leonardo da (1452-1519) / Bibliotheque de l'Institut de France, Paris, France / Bridgeman Images

AII80166: Two studies of a hanging skeleton (pen & ink with wash), Vinci, Leonardo da (1452-1519) / Gabinetto dei Disegni e Stampe, Galleria Degli Uffizi, Florence, Tuscany, Italy / Bridgeman Images

XJF311695: Study for the head of a soldier in 'The Battle of Anghiari', c.1504-05 (red chalk on paper), Vinci, Leonardo da (1452-1519) / Museum of Fine Arts (Szepmuveszeti) Budapest, Hungary / Bridgeman Images

ROC4071675: A deluge, c.1517-18 (chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images