Leonardo Da Vinci's Incredible Studies Of Human Anatomy Still Don't Get The Recognition They Deserve

(MENAFN- The Conversation) The mere mention of Leonardo da Vinci evokes genius. We know him as a polymath whose interests spanned astronomy, geology, hydrology, engineering and physics. As a painter, his Mona Lisa and Last Supper are considered works of mastery.

Yet one great achievement that frequently goes unrecognised is his studies of human anatomy. More than 500 years after his death, it's time this changed.

Leonardo is thought to have been born on April 15 1452 in Anchiano, a small hamlet near the town of Vinci, close to Florence. His mother was a 16-year-old peasant girl called Caterina di Meo Lippi, and his father was Ser Piero da Vinci, a 26-year-old notary.

Being illegitimate, the young Leonardo was only permitted an elementary education in reading, writing and arithmetic. He was also barred from becoming a notary, but this worked out to his advantage. Instead of being constrained by life as an officiate, he was free to be creative and explore the world of nature, satisfying his insatiable appetite for knowledge.

The human anatomy became one of his great interests. This was seeded during his time as an apprentice in Andrea del Verrocchio's bottega (studio) in Florence, where studying the human form was crucial for achieving realistic depictions.

Creating detailed anatomical drawings required precise sketching skills and the ability to accurately depict the structures being studied. As Leonardo's fascination grew, he would delve deeper into anatomy as a discipline.

This traces back to the 2nd-century Greek physician Galen of Pergamum , whose anatomical descriptions were mostly based on insights he had gained through dissecting animals and studying wounded gladiators. However, he did no human dissections – they were illegal during his time – and many of his extrapolations from animal to human anatomy were wrong .

It wasn't until the 14th century that anatomy and medical science advanced thanks to the start of systematic human cadaver dissections. The physician Mondino de Liuzzi , who practised the first public dissections of human cadavers at the University of Bologna, published the first modern anatomical text, Anathomia Corporis Humani , in 1316.

The text was mostly descriptive in nature, like that of Galen, lacking drawings to illustrate anatomy. Subsequent texts on the subject during the 14th and early 15th centuries did contain drawings, but these were basic and unrealistic.

Leonardo advanced this discipline through his remarkable observational skills, knowledge of perspective and, most notably, his outstanding drawing abilities. His anatomical sketches were unlike anything seen before. For example, his sketches of the muscles of the arms and human skull are comparable to illustrations in today's medical anatomy texts.

According to Leonardo's biographer, Giorgio Vasari , the artist“was one of the first who, with Galen's teachings, began to bring honour to medical studies and to shed real light upon anatomy, which had until that time been shrouded in the deepest shadows of ignorance”.

Leonardo was the first to depict a detailed study of the human spine, showing its natural curvature and correctly numbered vertebrae. He drew and described nearly all the bones and muscles of the body in beautiful detail, as well as investigating their biomechanics .

His studies on the heart combined both experimentation and observation. Using an ox's heart to understand blood flow though the aortic valves, Leonardo poured molten wax into the surrounding cavities to make a wax cast, from which a glass model of the heart was made. He then pumped water mixed with grass seeds through this model to visualise the flow pattern. From this experiment, he concluded that the vortex-like flow of blood through the aortic valves was responsible for closing them during each heartbeat.

Over 450 years later, in 1968, scientists used dyes and radiography methods to observe this blood flow and prove that Leonardo was correct. A study in 2014 using MRI (magnetic resonance imaging) also demonstrated that he had provided a strikingly precise depiction of these vortex-like flows.

Leonardo may have dissected around 30 human corpses during his lifetime. Most took place at the Santa Maria Nuova hospital in Florence, and later at the Santo Spirito hospital in Rome. The fact he didn't have more human cadavers to study probably helps to explain why he also got things wrong.

In addition, Leonardo was very influenced by Galen, through his readings of both Mondino de Liuzzi and the Persian writer Avicenna (c980-1037), while also dissecting animals such as dogs, cattle and horses to fill in human anatomical gaps.

This approach is evident in his study of the male and female reproductive system, as I found when carrying out a detailed review of his work in this area. Misconceptions included the presence of three channels in the penis for semen, urine and“animal spirit”. The prostate gland is also missing in all his sketches of the male reproductive system. Meanwhile, he made the uterus spherical (derived from cow dissections), and similarly misrepresented the fallopian tubes and ovaries.

Even then, Leonardo still got a lot right. He correctly depicts the position of the foetus in the uterus, and the umbilical cord anatomy. He also correctly argued that penile erections were caused by blood engorgement and not by air or“vital spirits” flowing into the penis, as suggested by Galen.

Where he got things wrong, Leonardo's shifting focus may also have played a part. His restlessness, disorganised notes and unfinished work suggest ADHD (attention deficit hyperactivity disorder). Equally, this may also explain his boundless curiosity and incredible creativity.

Despite his shortcomings, Leonardo's anatomical studies were centuries ahead of their time, rivalling modern standards. His work in this area might have been more appreciated had he published it in a book: he had planned one, and is said to have been collaborating with the Renaissance physician and professor, Marc'Antonio della Torre .

Unfortunately, this was cut short with Marc'Antonio's death in 1511. Leonardo died in 1519 at the age of 67, and while his gifts to the world have received endless attention, his important contributions to anatomy remain overshadowed, and deserve greater recognition.

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