"Anathomia" opens with the assertion that human beings are superior to all other creatures because of their intellect, reasoning ability, tool-making abilities, and upright stature; because he possesses these noble qualities, man is worthy to be studied. Mondino goes on to describe the organs in the order in which they present themselves during the dissection process. Dissection began with the opening of the abdominal cavity via vertical incision running from the stomach to the pectoral muscles and a horizontal cut above the navel. First, the musculature of the intestinal tract is described in detail, followed by an extensive discussion of the form, function, and position of the stomach. According to the text, the stomach is spherical; the stomach wall has an internal lining, which is "the seat of sensation", and an external fleshy coat that is involved in digestion. In order to access the spleen, which was thought to secrete black bile into the stomach through imaginary canals, the dissector was required to remove the "false ribs". The liver is said to have five lobes, the gallbladder is described as the seat of yellow bile, and the cecum is described with no mention of the vermiform appendix. Though "Anathomia" only vaguely describes the pancreas, the pancreatic duct is discussed in greater detail. He also makes new observations regarding the anatomy of the bladder and the enlargement of the uterus during both menstruation and pregnancy.