query: Who first performed human dissection?
passage: Dissection
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.[7] During this period, the first exploration into full human anatomy was performed rather than a base knowledge gained from 'problem-solution' delving.[8] 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.[8] For a time, Roman law forbade dissection and autopsy of the human body,[9] so physicians had to use other cadavers. Galen, for example, dissected the Barbary macaque and other primates, assuming their anatomy was basically the same as that of humans.[10][11][12]
passage: Heller myotomy
It was first performed by Ernst Heller (1877–1964) in 1913. Then and until recently, this surgery was performed using an open procedure, either through the chest (thoracotomy) or through the abdomen (laparotomy). However, open procedures involve greater recovery times. Modern Heller myotomy is normally performed using minimally invasive laparoscopic techniques, which minimize risks and speeds recovery significantly. The 100th anniversary of Heller’s description of the surgical treatment of patients with achalasia was celebrated in 2014.