dissection dissection dissection (from latin dissecare "to cut to pieces"; also called anatomization) is the dismembering of the body of a deceased animal or plant to study its anatomical structure. autopsy is used in pathology and forensic medicine to determine the cause of death in humans. less extensive dissection of plants and smaller animals preserved in a formaldehyde solution is typically carried out or demonstrated in biology and natural science classes in middle school and high school, while extensive dissections of cadavers of adults and children, both fresh and preserved are carried out by medical students in medical schools as a part of the teaching in subjects such as anatomy, pathology and forensic medicine. consequently, dissection is typically conducted in a morgue or in an anatomy lab. dissectiondissection of a pregnant rat in a biology classginkgo seed in dissection, showing embryo and gametophyte.identifiersmeshd004210anatomical terminology dissection has been used for centuries to explore anatomy. objections to the use of cadavers have led to the use of alternatives including virtual dissection of computer models. in the field of surgery, the term "dissection" or "dissecting" means more specifically to the practice of separating an anatomical structure (an organ, nerve or blood vessel) from its surrounding connective tissue in order to minimize unwanted damage during a surgical procedure. overview plant and animal bodies are dissected to analyze the structure and function of its components. dissection is practised by students in courses of biology, botany, zoology, and veterinary science, and sometimes in arts studies. in medical schools, students dissect human cadavers to learn anatomy. dissection is used to help to determine the cause of death in autopsy (called necropsy in other animals) and is an intrinsic part of forensic medicine. a key principle in the dissection of human cadavers is the prevention of human disease to the dissector. prevention of transmission includes the wearing of protective gear, ensuring the environment is clean, dissection technique and pre-dissection tests to specimens for the presence of hiv and hepatitis viruses. specimens are dissected in morgues or anatomy labs. when provided, they are evaluated for use as a "fresh" or "prepared" specimen. a "fresh" specimen may be dissected within some days, retaining the characteristics of a living specimen, for the purposes of training. a "prepared" specimen may be preserved in solutions such as formalin and pre-dissected by an experienced anatomist, sometimes with the help of a diener. this preparation is sometimes called prosection. dissection tools. left to right: scalpels with no. 20 and no. 12 blades, two forceps and scissors most dissection involves the careful isolation and removal of individual organs, called the virchow technique. an alternative more cumbersome technique involves the removal of the entire organ body, called the letulle technique. this technique allows a body to be sent to a funeral director without waiting for the sometimes time-consuming dissection of individual organs. the rokitansky method involves an in situ dissection of the organ block, and the technique of ghon involves dissection of three separate blocks of organs - the thorax and cervical areas, gastrointestinal and abdominal organs, and urogenital organs. dissection of individual organs involves accessing the area in which the organ is situated, and systematically removing the anatomical connections of that organ to its surroundings. for example, when removing the heart, connects such as the superior vena cava and inferior vena cava are separated. if pathological connections exist, such as a fibrous pericardium, then this may be deliberately dissected along with the organ. history galen (129–c.200 ad), opera omnia, dissection of a pig. engraving made in venice, 1565 classical antiquity human dissections were carried out by the greek physicians herophilus of chalcedon and erasistratus of chios in the early part of the third century bc. during this period, the first exploration into full human anatomy was performed rather than a base knowledge gained from 'problem-solution' delving. while there was a deep taboo in greek culture concerning human dissection, there was at the time a strong push by the ptolemaic government to build alexandria into a hub of scientific study. for a time, roman law forbade dissection and autopsy of the human body, so anatomists relied on the cadavers of animals or made observations of human anatomy from injuries of the living. galen, for example, dissected the barbary macaque and other primates, assuming their anatomy was basically the same as that of humans, and supplemented these observations with knowledge of human anatomy which he acquired while tending to wounded gladiators. india the ayurvedic man., c. 18th century the ancient societies that were rooted in india left behind artwork on how to kill animals during a hunt. the images showing how to kill most effectively depending on the game being hunted relay an intimate knowledge of both external and internal anatomy as well as the relative importance of organs. the knowledge was mostly gained through hunters preparing the recently captured prey. once the roaming lifestyle was no longer necessary it was replaced in part by the civilization that formed in the indus valley. unfortunately, there is little that remains from this time to indicate whether or not dissection occurred, the civilization was lost to the aryan people migrating. early in the history of india (2nd to 3rd century), the arthashastra described the 4 ways that death can occur and their symptoms: drowning, hanging, strangling, or asphyxiation. according to that source, an autopsy should be performed in any case of untimely demise. the practice of dissection flourished during the 7th and 8th century. it was under their rule that medical education was standardized. this created a need to better understand human anatomy, so as to have educated surgeons. dissection was limited by the religious taboo on cutting the human body. this changed the approach taken to accomplish the goal. the process involved the loosening of the tissues in streams of water before the outer layers were sloughed off with soft implements to reach the musculature. to perfect the technique of slicing, the prospective students used gourds and squash. these techniques of dissection gave rise to an advanced understanding of the anatomy and the enabled them to complete procedures used today, such as rhinoplasty. during medieval times the anatomical teachings from india spread throughout the known world; however, the practice of dissection was stunted by islam. the practice of dissection at a university level was not seen again until 1827, when it was performed by the student pandit madhusudan gupta. through the 1900s, the university teachers had to continually push against the social taboos of dissection, until around 1850 when the universities decided that it was more cost effective to train indian doctors than bring them in from britain. indian medical schools were, however, training female doctors well before those in england. the current state of dissection in india is deteriorating. the number of hours spent in dissection labs during medical school has decreased substantially over the last twenty years. the future of anatomy education will probably be an elegant mix of traditional methods and integrative computer learning. the use of dissection in early stages of medical training has been shown more effective in the retention of the intended information than their simulated counterparts. however, there is use for the computer-generated experience as review in the later stages. the combination of these methods is intended to strengthen the students' understanding and confidence of anatomy, a subject that is infamously difficult to master. there is a growing need for anatomist—seeing as most anatomy labs are taught by graduates hoping to complete degrees in anatomy—to continue the long tradition of anatomy education. islamic world page from a 1531 latin translation by peter argellata of al-zahrawi's c. 1000 treatise on surgical and medical instruments from the beginning of the islamic faith in 610 a.d., shari'ah law has applied to a greater or lesser extent within muslim countries, supported by islamic scholars such as al-ghazali. islamic physicians such as ibn zuhr (avenzoar) (1091–1161) in al-andalus, saladin's physician ibn jumay during the 12th century, abd el-latif in egypt c. 1200, and ibn al-nafis in syria and egypt in the 13th century may have practiced dissection, but it remains ambiguous whether or not human dissection was practiced. ibn al-nafis, a physician and muslim jurist, suggested that the "precepts of islamic law have discouraged us from the practice of dissection, along with whatever compassion is in our temperament", indicating that while there was no law against it, it was nevertheless uncommon. islam dictates that the body be buried as soon as possible, barring religious holidays, and that there be no other means of disposal such as cremation. prior to the 10th century, dissection was not performed on human cadavers. the book al-tasrif, written by al-zahrawi in 1000 a.d., details surgical procedure that differed from the previous standards. the book was an educational text of medicine and surgery which included detailed illustrations. it was later translated and took the place of avicenna's the canon of medicine as the primary teaching tool in europe from the 12th century to the 17th century. there were some that were willing to dissect humans up to the 12th century, for the sake of learning, after which it was forbidden. this attitude remained constant until 1952, when the islamic school of jurisprudence in egypt ruled that "necessity permits the forbidden". this decision allowed for the investigation of questionable deaths by autopsy. in 1982, the decision was made by a fatwa that if it serves justice, autopsy is worth the disadvantages. though islam now approves of autopsy, the islamic public still disapproves. autopsy is prevalent in most muslim countries for medical and judicial purposes. in egypt it holds an important place within the judicial structure, and is taught at all the country's medical universities. in saudi arabia, whose law is completely dictated by shari'ah, autopsy is viewed poorly by the population but can be compelled in criminal cases; human dissection is sometimes found at university level. autopsy is performed for judicial purposes in qatar and tunisia. human dissection is present in the modern day islamic world, but is rarely published on due to the religious and social stigma. tibet tibetan medicine developed a rather sophisticated knowledge of anatomy, acquired from long-standing experience with human dissection. tibetans had adopted the practice of sky burial because of the country's hard ground, frozen for most of the year, and the lack of wood for cremation. a sky burial begins with a ritual dissection of the deceased, and is followed by the feeding of the parts to vultures on the hill tops. over time, tibetan anatomical knowledge found its way into ayurveda and to a lesser extent into chinese medicine. christian europe a dissection in realdo colombo's de re anatomica, 1559 throughout the history of christian europe, the dissection of human cadavers for medical education has experienced various cycles of legalization and proscription in different countries. dissection was rare during the middle ages, but it was practised, with evidence from at least as early as the 13th century. the practice of autopsy in medieval western europe is "very poorly known" as few surgical texts or conserved human dissections have survived. a modern jesuit scholar has claimed that the christian theology contributed significantly to the revival of human dissection and autopsy by providing a new socio-religious and cultural context in which the human cadaver was no longer seen as sacrosanct. an edict of the 1163 council of tours, and an early 14th-century decree of pope boniface viii have mistakenly been identified as prohibiting dissection and autopsy, misunderstanding or extrapolation from these edicts may have contributed to reluctance to perform such procedures. the middle ages witnessed the revival of an interest in medical studies, including human dissection and autopsy. mondino de luzzi's anathomia, 1541 frederick ii (1194–1250), the holy roman emperor, ruled that any that were studying to be a physician or a surgeon must attend a human dissection, which would be held no less than every five years. some european countries began legalizing the dissection of executed criminals for educational purposes in the late 13th and early 14th centuries. mondino de luzzi carried out the first recorded public dissection around 1315. at this time, autopsies were carried out by a team consisting of a lector, who lectured, the sector, who did the dissection, and the ostensor who