ISSN:
1432-0878
Schlagwort(e):
Sites of ultrafiltration
;
Gastropoda
;
Podocytes
;
Electron microscopy
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Medizin
Notizen:
Summary In the Gastropoda pressure-ultrafiltration of the blood is assumed to be the first step in urine formation. The most probable site of ultrafiltration is the wall of the heart. Since in other animal groups ultrafilters are characterized by a special cell type, the podocyte, the hearts of two pulmonates (Lymnaea stagnalis, Biomphalaria glabrata) and of four prosobranchs (Viviparus viviparus, Bithynia tentaculata, Ampullaria gigas, Littorina littorea) were ultrastructurally investigated, in order to establish whether or not podocytes occur in these structures. It appeared that only in the wall of the auricle of Viviparus podocytes are present. They form a layer underneath the epicardium, the epithelium covering the auricle. It is assumed that in Viviparus ultrafiltration proceeds in the auricle. The possible route of the pro-urine is discussed. The location of the ultrafilters in the other species studied remains still unknown.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00307419
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