title: [Autoradiographic study of the proliferative activity of the preoptic recess ependyma in yearling and juvenile common frogs].
abstract: Proliferative activity of the ependyma, lining the recessus praeopticus in juvenile frogs was studied with 3H-thymidine radioautography. Usually much more pronounced proliferation of ependymal cells occurred in the preoptic region in one year old frogs as compared with two year old ones. It can be concluded that in the former animals the migration of postmitotic labeled cells into the subependymal zone of the recessus preoptic area is significantly more intense. By the 30th day after multiple isotope injections some newly formed neurosecretory cells with labeled nuclei were found in the 1-5 cellular position of the recessus praeopticus subependymal zone. It is postulated that in juvenile frogs the ependyma of lateral wall of recessus praeopticus is probably a source ("cambium"), from which some young neurosecretory cells may originate.
mesh_terms: D000818:Animals; D001345:Autoradiography; D002455:Cell Division; D002465:Cell Movement; D004805:Ependyma / Q000166:cytology*; D009490:Neurosecretory Systems / Q000166:cytology; D011301:Preoptic Area / Q000166:cytology*; D011896:Rana temporaria; D013997:Time Factors
vernacular_title: Avtoradiograficheskoe issledovanie proliferativnoĭ aktivnosti épendimy preopticheskoĭ bukhty u odnoletnikh i dvukhletnikh osobeĭ travianoĭ liagushki.