the investigation has been performed on 107 renal preparations obtained from persons of various age ( from 5-month-old fetuses up to 45 years of age ) , certain representatives of other classes of the vertebrata are also included : fish , amphibia , reptile and mammalia at various stages of pre- and postnatal periods of ontogenesis by means of preparing graphic and plastic reconstructive models , histological investigation and microdissection .
C0027361
persons
C0015965
fetuses