The text around the image describes the scale and proportion of each part of the body. Sketches of the Human Head, Leonardo da Vinci, c.1489-90, pen and ink In this set of sketches Da Vinci looked ...

However, the head height, arm span ... The Vitruvian Man is based on the correlations of ideal human proportions with geometry described by the ancient Roman architect Vitruvius in Book III ...

“The whole hand will be the tenth part of the man; From the bottom of the chin to the top of the head is an eighth ... based on the symmetry and proportion of the human form.