Müller, Johannes Peter (1801–1858),
German physiologist and anatomist. Müller is generally acclaimed as one of the greatest biologists of all time. In 1834–40 he published a handbook of physiology that ranks as the first great text on that subject produced in the 19th century. In histology he described the microscopic anatomy of a large series of secreting glands. He was the first to classify the excretory system of the glands as an independent system of tubes; he noted that the blood vessels formed only a capillary network. He described the Müllerian duct in 1825.