caa a22 4500 477095518 CHVBK 20180405111526.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF00186696 doi (NATIONALLICENCE)springer-10.1007/BF00186696 Structure of the amphibian mesonephric tubule during ontogenesis in Rana ridibunda L. tadpoles: early ontogenetic stages, renal corpuscle formation, neck segment and peritoneal funnels [Elektronische Daten] [J. Meseguer, A. García-Ayala, A. López-Ruiz, M. Esteban] The morphological changes produced in the mesonephric tubule during ontogenesis, not previously reported in amphibians, are described in Rana ridibunda tadpoles using light and electron microscopic methods. The rudimentary nephron units do not develop synchronously along the subperitoneal nephrogenic ridged cord. The first signs of morphogenesis are the presence of round euchromatinic nuclei and mitotic figures. The subsequent developmental stages are characterized by detachment of the rudimentary nephrons from the nephrogenic cord. Renal corpuscle formation is characterized by glomerular expansion, differentiation of large fenestrated capillaries and the presence of a discrete mesangium and a small capsular space. Interstitial capillaries next to the renal corpuscle rudiments appear to induce invagination and differentiation of the capsular epithelium. Developing podocytes were cuboidal undifferentiated epithelial cells with scarce primary processes and with an extensive part of the cell surface lying flat on the glomerular basement membrane. These features reflect low or no glomerular filtration during nephron development. The ciliated neck segment and peritoneal funnels show similar structural features. The latter were not physically connected with the nephrons, but opened into renal blood vessels. Involutive peritoneal funnels were observed. Springer-Verlag, 1996 Kidney nationallicence Mesonephric tubule nationallicence Ontogenesis nationallicence Amphibia nationallicence Meseguer J. Department of Cell Biology, Faculty of Biology, University of Murcia, E-30100, Murcia, Spain aut García-Ayala A. Department of Cell Biology, Faculty of Biology, University of Murcia, E-30100, Murcia, Spain aut López-Ruiz A. Department of Cell Biology, Faculty of Biology, University of Murcia, E-30100, Murcia, Spain aut Esteban M. Department of Cell Biology, Faculty of Biology, University of Murcia, E-30100, Murcia, Spain aut Anatomy and Embryology Springer-Verlag 193/4(1996-04-01), 397-406 0340-2061 193:4<397 1996 193 429 https://doi.org/10.1007/BF00186696 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00186696 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Meseguer J. Department of Cell Biology, Faculty of Biology, University of Murcia, E-30100, Murcia, Spain aut NATIONALLICENCE 700 1- García-Ayala A. Department of Cell Biology, Faculty of Biology, University of Murcia, E-30100, Murcia, Spain aut NATIONALLICENCE 700 1- López-Ruiz A. Department of Cell Biology, Faculty of Biology, University of Murcia, E-30100, Murcia, Spain aut NATIONALLICENCE 700 1- Esteban M. Department of Cell Biology, Faculty of Biology, University of Murcia, E-30100, Murcia, Spain aut NATIONALLICENCE 773 0- Anatomy and Embryology Springer-Verlag 193/4(1996-04-01), 397-406 0340-2061 193:4<397 1996 193 429 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer