Question: How many anatomy drawings did he have?
About the article "Leonardo da Vinci", section "Anatomy".

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For many years, Pronk toured the Dutch Republic in summer, usually on foot, to sketch views of cities, towns, and landscapes, as well as castles, stately homes and other buildings, documenting in detail when and where each sketch was made.
Each of these field sketches would form the basis for one or several drawings, which he produced back in his studio.
On his travels, he would occasionally cross the border into Germany, as he did in 1729 for instance, when he made drawings around Kleve and Cologne.
Together with his pupils Jan de Beijer (1703–c.1780) and Abraham de Haen (1707–1748), he produced over 700 drawings for "Het verheerlykt Nederland" ("The glorified Netherlands"), a multi-volume work published in 1745-1774 documenting all the provinces of the Dutch Republic.
Many of his drawings were turned into engravings by other artists such as Hendrik Spilman and Simon Fokke.
Pronk also contributing drawings to a 1760 atlas of the province of Zeeland, "Een en twintig gezigten der stemmende steden van Zeeland en derzelver voorname gebouwen".
Pronk's drawing technique developed rapidly in the period 1727 to 1731.
He began to use subtle lighting and shadow effects and also added numerous anecdotal details to his drawings.
Thereby the drawings attained not only documentary but also artistic value.
Pronk's drawings are characterized by clear, simple lines that captured the essence of the buildings he depicted.
He knew how to leave out details that would have crowded the drawings.
His pupil and close friend Abraham de Haen wrote numerous poems in his honour.
Pronk also dabbled in poetry himself.
Four of Pronk's sketchbooks are in the collection of the Rijksprentenkabinet (National Cabinet of Prints), now part of the Rijksmuseum in Amsterdam.
In 1997, the Frans Hals Museum in Haarlem held an exhibition of Pronk's work. 
As Leonardo became successful as an artist, he was given permission to dissect human corpses at the hospital Santa Maria Nuova in Florence.
Later he dissected in Milan at the hospital Maggiore and in Rome at the hospital Santo Spirito (the first mainland Italian hospital).
From 1510 to 1511 he collaborated in his studies with the doctor Marcantonio della Torre.
""I have removed the skin from a man who was so shrunk by illness that the muscles were worn down and remained in a state like thin membrane, in such a way that the sinews instead of merging in muscles ended in wide membrane; and where the bones were covered by the skin they had very little over their natural size.""
In 30 years, Leonardo dissected 30 male and female corpses of different ages.
Together with Marcantonio, he prepared to publish a theoretical work on anatomy and made more than 200 drawings.
However, his book was published only in 1680 (161 years after his death) under the heading "Treatise on painting".
Among the detailed images that Leonardo drew are many studies of the human skeleton.
He was the first to describe the double S form of the backbone.
He also studied the inclination of pelvis and sacrum and stressed that sacrum was not uniform, but composed of five fused vertebrae.
Leonardo was a physiologist as well as an anatomist, studying the function of the human body as well as examining and recording its structure.
He dissected and drew the human skull and cross-sections of the brain, transversal, sagittal, and frontal.
These drawings may be linked to a search for the "sensus communis", the locus of the human senses, which, by Medieval tradition, was located at the exact physical center of the skull.
Leonardo studied internal organs, being the first to draw the human appendix and the lungs, mesentery, urinary tract, reproductive organs, the muscles of the cervix and a detailed cross-section of coitus.
He was one of the first to draw a scientific representation of the fetus in the intrautero.
Leonardo studied the vascular system and drew a dissected heart in detail.
He correctly worked out how heart valves ebb the flow of blood yet he did not fully understand circulation as he believed that blood was pumped to the muscles where it was consumed.
In 2005 a UK heart surgeon, Francis Wells, from Papworth Hospital Cambridge, pioneered repair to damaged hearts, using Leonardo's depiction of the opening phase of the mitral valve to operate without changing its diameter allowing an individual to recover more quickly.
Wells said "Leonardo had a depth of appreciation of the anatomy and physiology of the body - its structure and function - that perhaps has been overlooked by some.
"Leonardo's observational acumen, drawing skill, and the clarity of depiction of bone structures reveal him at his finest as an anatomist.
However, his depiction of the internal soft tissues of the body are incorrect in many ways, showing that he maintained concepts of anatomy and functioning that were in some cases millennia old, and that his investigations were probably hampered by the lack of preservation techniques available at the time.
Leonardo's detailed drawing of the internal organs of a woman (See left) reveal many traditional misconceptions.
Leonardo's study of human anatomy led also to the design of the first known robot in recorded history.
The design, which has come to be called Leonardo's robot, was probably made around the year 1495 but was rediscovered only in the 1950s. 
Society and culture.
Anatomy has become a key part of the visual arts.
Basic concepts of how muscles and bones function and change with movement are vital in drawing, painting or animating a human figure.
Many books (such as "Human Anatomy for Artists: The Elements of Form") have been written as guides to drawing the human body anatomically correctly.
Leonardo da Vinci sought to improve his art through a better understanding of human anatomy.
In the process he advanced both human anatomy and its representation in art.
Because the structure of living organisms is complex, anatomy is organized by levels, from the smallest components of cells to the largest organs and their relationship to others. 
Leonardo's formal training in the anatomy of the human body began with his apprenticeship to Andrea del Verrocchio, who insisted that all his pupils learn anatomy.
As an artist, he quickly became master of "topographic anatomy", drawing many studies of muscles, tendons and other visible anatomical features.
As a successful artist, he was given permission to dissect human corpses at the Hospital of Santa Maria Nuova in Florence and later at hospitals in Milan and Rome.
From 1510 to 1511 he collaborated in his studies with the doctor Marcantonio della Torre.
Leonardo made over 240 detailed drawings and wrote about 13,000 words towards a treatise on anatomy.
These papers were left to his heir, Francesco Melzi, for publication, a task of overwhelming difficulty because of its scope and Leonardo's idiosyncratic writing.
It was left incomplete at the time of Melzi's death more than fifty years later, with only a small amount of the material on anatomy included in Leonardo's "Treatise on painting", published in France in 1632.
During the time that Melzi was ordering the material into chapters for publication, they were examined by a number of anatomists and artists, including Vasari, Cellini and Albrecht Dürer who made a number of drawings from them.
Leonardo's anatomical drawings include many studies of the human skeleton and its parts, and studies muscles and sinews.
He studied the mechanical functions of the skeleton and the muscular forces that are applied to it in a manner that prefigured the modern science of biomechanics.
He drew the heart and vascular system, the sex organs and other internal organs, making one of the first scientific drawings of a fetus "in utero".
The drawings and notation are far ahead of their time, and if published, would undoubtedly have made a major contribution to medical science.
As an artist, Leonardo also closely observed and recorded the effects of age and of human emotion on the physiology, studying in particular the effects of rage.
He also drew many figures who had significant facial deformities or signs of illness.
Leonardo also studied and drew the anatomy of many animals, dissecting cows, birds, monkeys, bears, and frogs, and comparing in his drawings their anatomical structure with that of humans.
He also made a number of studies of horses.
Besides "Kaitai Shinsho", he also authored "Rangaku Kotohajime" (Beginning of Dutch Studies).
Sugita assembled a team of Japanese translators and doctors to translate a Dutch book of anatomy: Kulmus' "Ontleedkundige Tafelen".
He did so because he found out, after observing the dissection of a human corpse, that the western drawings of human organs were much more accurate than the ones in his Chinese handbooks.
They tried to make a Japanese translation.
At a rate of one page a week/month, the work was published in 1774.
As an example of how difficult this work was, the collaborators had to study and discuss for several days before they realised that "neus" (nose) in Dutch, being a bulb on the front, meant "hana" (鼻) in Japanese.