ANATOMICAL SKETCHES
Translation:
“Vitruvius, the architect, says in his work on architecture that the measurements of the human body are distributed by Nature as follows: that is that 4 fingers make 1 palm and 4 palms make 1 foot, 6 palms make 1 cubit; 4 cubits make a man’s height. And 4 cubits make one pace and 24 palms make a man; and these measures he used in his building. If you open your legs so much as to decrease your height 1/4 and spread and raise your arms till your middle fingers touch the level of the top of your head you must know that the centre of the outspread limbs will be in the navel and the space between the legs will be an equilateral triangle.”
“From the roots of the hair to the bottom of the chin is the tenth of a man’s height; from the bottom of his head to the top of his chin is one eighth of his height; from the top of the breast to the top of his head will be one sixth of a man. From the top of the breast to the roots of the hair will be the seventh part of the whole man. From the nipples to the top of the head will be the fourth part of a man. The greatest width of the shoulders contains in itself the fourth part of the man. From the elbow to the tip of the hand will be the fifth part of a man; and from the elbow to the angle of the armpit will be the eighth part of the man. The whole hand will be the tenth part of the man; the beginning of the genitals marks the middle of the man. The foot is the seventh part of the man. From the sole of the foot to below the knee will be the fourth part of the man. From below the knee to the to the beginning of the genitals will be the fourth part of the man. The distance from the bottom of the chin to the nose and from the roots of the hair to the eyebrows is, in each case the same, and like the ear, a third of the face.”
The Vitruvian Man
“The length of a man’s outspread arms is equal to his height.”
Leonardo did extensive studies of the human body to become a better painter and to understand how bodies worked. He took careful notes on how body parts were proportioned to other body parts and the whole human, as can be read from the Vitruvian Man. In his later years, Leonardo studied cadavers to discover more about humans.

Here are some of his sketches: "The noblest pleasure is the joy of understanding." - Leonardo da Vinci “The human foot is a masterpiece of engineering and a work of art.”
-Leonardo da Vinci