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. 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 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.
Henry Dalton
Henry C. Dalton (born May 7, 1847) was superintendent of the St. Louis City Hospital from 1886 to 1892, and later a professor of abdominal and clinical surgery at Marion Sims College of Medicine (now part of the St. Louis University School of Medicine) . He is noted for being the first American to perform the suturing of the pericardium on record. Spanish surgeon Francisco Romero was documented with performing two successful surgeries in 1801 and French surgeon Dominique Jean Larrey was documented as successfully performing surgery on a woman's pericardium in 1810.