[Ultrastructure of the renal corpuscle of fresh water fishes].
By means of light (semithin slices) and electron microscopes structural organization of the corpuscle and glomerulus of the capsule has been studied in freshwater fishes--carp (Cyprinus carpio) and crucian carp (Carassius carassius). The diameter of their glomeruli are in the carp from 80.8 +/- 1.4 mcm up to 59.8 +/- 2.4 mcm and in the crucian carp--from 86.4 +/- 1.8 mcm up to 69.25 +/- 0.2 mcm. Between these dimensions there are significant differences. Components of the external wall of the capsule in the fishes studied have similar structure. In epitheliocytes, situating on the basement membrane, electron opaque inclusions have been revealed. They resemble, by their ultrastructure, granules of peripolar cells, described in mammals and in man. In places, where epitheliocytes have contacts, thin folds are formed, they turn into the capsule lumen. Touching the cell surface, they can form border vacuoles. The main peculiarity of endotheliocytes in the glomerular capillaries is presence of diaphragmated and open fenestrae (their size is from 30 to 50 nm) in the peripheral zone of their cytoplasm. Unlike the higher vertebrates, the fishes have a well developed pericapillary mesangium. It contains mesangial matrix and rare processes of mesangiocytes.
Koval'chuk
L E
LE
Likhacheva
L M
LM
D000818:Animals; D001699:Biometry; D002347:Carps / Q000033:anatomy & histology*; D005618:Fresh Water; D007668:Kidney / Q000648:ultrastructure*; D007678:Kidney Glomerulus / Q000648:ultrastructure; D008854:Microscopy, Electron; D008867:Microtomy
Ul'trastruktura pochechnogo tel'tsa presnovodnykh ryb.