Myringotomy and tympanostomy, in parallel with the general distinction between an -otomy (cutting) and an -ostomy (creating a stoma with some degree of permanence or semipermanence). In this distinction, only a tympanostomy involves tympanostomy tubes and creates a semipermanent stoma. This distinction in usage is not always made. The word "tympanocentesis" specifies that centesis (aspiration for sampling) is being done. Etymologically, "myringotomy" ("myringo-", from Latin "myringa" "eardrum", + "-tomy") and "tympanotomy" ("tympano-" + "-tomy") both mean "eardrum cutting", and "tympanostomy" ("tympano-" + "-stomy" means "making an eardrum stoma". In 1649, Jean Riolan the Younger accidentally pierced a patient's ear drum while
Composition of the human body mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium. All 11 are necessary for life. The remaining elements are trace elements, of which more than a dozen are thought on the basis of good evidence to be necessary for life. All of the mass of the trace elements put together (less than 10 grams for a human body) do not add up to the body mass of magnesium, the least common of the 11 non-trace elements.