Cadaver

A cadaver is a human body that has died. The term comes from the Latin word "cadere," which means "to fall." While the word is often used in courts of law or by news outlets, it has a very important role in science. Medical students, physicians, and scientists use cadavers to study anatomy, which is the structure of the body. They use them to find where diseases occur and to determine causes of death. Cadavers are also used to test new surgical instruments. In some cases, doctors use a cadaver graft, which is tissue from a dead body used to repair a living person.

When a body dies, it undergoes a process called decomposition. This process happens in three distinct stages. The first stage is autolysis, or self-digestion. This occurs because the active processes in cells stop. As a result, digestive enzymes are released into the cells. This creates liquid that seeps between skin layers, causing the skin to peel. If flies are present, they lay eggs in body openings like the mouth or nose. The resulting larvae, or maggots, then consume the body tissue.

The second stage is known as bloating. This usually happens around the second week of decomposition. Bacteria in the gut break down tissues and release gas. This gas becomes trapped in the intestines because the small intestine collapses early. This causes the abdomen, mouth, tongue, or genitals to swell. This bloating continues until the body decomposes enough for the gas to escape. The rate of this process depends on the environment. Warmer and more humid settings make decomposition happen much faster.

The third stage is putrefaction, which is the longest stage. During putrefaction, larger body structures break down and tissues liquefy. The brain, lungs, and digestive organs are often the first to disintegrate. Under normal conditions, these organs become unidentifiable after three weeks. Bacteria or animals may also eat the muscles. Eventually, only the skeleton remains, sometimes after several years. In soils that are rich in acid, even the skeleton will eventually dissolve into base chemicals.

The history of studying cadavers is full of controversy. In the 3rd century, Herophilus of Chalcedon and Erasistratus of Ceos practiced dissection in Alexandria. This was the main way to learn anatomy at that time. However, the practice lost popularity after they died. It did not return until the 12th century. In 1231, Holy Roman emperor Frederick II issued a major decree. He required that one human body be dissected every five years for medical training. This led to the first sanctioned public dissection since 300 B.C., performed by Mondino de Liuzzi.

Despite this, the public often viewed dissection as immoral or unethical. Because of religious beliefs, the only legal cadavers were often criminals who were executed by hanging. This led to the practice of grave-robbing to meet the high demand from universities. In 1788, a massive event called the Resurrection Riot occurred in New York. About 5,000 people participated in the riot after a doctor's actions caused fear of grave-robbing. This unrest eventually led to the Anatomy Acts in the United States. These laws allowed the use of unclaimed bodies for science, which helped end grave-robbing.

Artists have also used cadavers to improve their work for centuries. Leonardo da Vinci studied anatomy to depict the human figure more accurately. He practiced drawing muscles and tendons by 1472. He used a method similar to architecture, looking at the body from many three-dimensional perspectives. Another scientist, Andreas Vesalius, worked with artists to create the book "De Humani Corporis Fabrica." These detailed drawings helped people see the inside of the body. Today, the study of anatomy remains a vital link between the fields of medicine and art.