title: [Comparative ultrastructural study of the inner medullary zone of the kidney of rodents with varying water access in the habitat environment].
abstract: Studies have been made on the papillary zone of the kidney in wild rodents Microtus oeconomus, M. afganus, Nesokia indica and Rhombomus opimus, representing related taxonomic species but differing with respect to accessibility to water. In animals with high concentrating capacity, pronounced peculiarities of ultrastructure of descending and ascending parts of Henle's loop, thin epithelial layer in the collecting tubules and poor development of interstitial tissue account for higher level of water reabsorption. On the contrary, cytoplasmic ultrastructure of the collecting tubules in more arid species in simpler, this fact being presumably unrelated to the level of water reabsorption. Therefore, adaptation of the species investigated to the level of water accessibility is accompanied by ultrastructural changes in the inner medullary zone of the kidney.
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D003411:Arvicolinae / Q000502:physiology*; D004463:Ecology; D007679:Kidney Medulla / Q000502:physiology / Q000648:ultrastructure*; D007685:Kidney Tubules, Collecting / Q000648:ultrastructure; D008138:Loop of Henle / Q000648:ultrastructure; D008854:Microscopy, Electron; D014881:Water Supply; D014882:Water-Electrolyte Balance
vernacular_title: Sravnitel'noe izuchenie ul'trastruktury vnutrenneĭ mozgovoĭ zony pochki u gryzunov s razlichnoĭ ovodnennost'iu sredy obitaniia.