Leonardo da Vinci, The cardiovascular system and principal organs of a woman, c.1509-10 Credit: Royal Collection Trust / (c) Her Majesty Queen Elizabeth II 2019
Leonardo da Vinci, The head of Leda, c.1505-8 Credit: Royal Collection Trust/(c) Her Majesty Queen Elizabeth II 2019
Detail of 'The cardiovascular system and principal organs of a woman', c.1509-10, showing thumbprint. Image width 3.3cm. Credit: Royal Collection Trust / (c) Her Majesty Queen Elizabeth II 2019.
Leonardo da Vinci, Sketches for the Last Supper, and other studies, c.1492-4 Credit: Royal Collection Trust/(c) Her Majesty Queen Elizabeth II 2019
Leonardo da Vinci, The skull sectioned, 1489 Credit: Royal Collection Trust/(c) Her Majesty Queen Elizabeth II 2019
Leonardo da Vinci, A study of a woman's hands, c.1490 Credit: Royal Collection Trust/(c) Her Majesty Queen Elizabeth II 2019
Leonardo da Vinci, The fetus in the womb, c.1511
Credit: Royal Collection Trust/(c) Her Majesty Queen Elizabeth II 2019
Leonardo da Vinci, The head of St James, and architectural sketches, c.1495, a study for the Last Supper
Credit: Royal Collection Trust / (c) Her Majesty Queen Elizabeth II 2019
Leonardo da Vinci, A map of Imola, 1502 Credit: Royal Collection Trust / (c) Her Majesty Queen Elizabeth II 2019
Leonardo da Vinci, The heart and coronary vessels, c.1511-13 Credit: Royal Collection Trust/(c) Her Majesty Queen Elizabeth II 2019
Leonardo da Vinci, The head of Judas, c.1495 or later, a study for the Last Supper 
 Credit: Royal Collection Trust/(c) Her Majesty Queen Elizabeth II 2019