title: [C-cells in the thyroid gland and in the remainder of the ultimobranchial body of bison].
abstract: C cells of the thyroid gland of 85 European bison, 43 males and 42 females, of age ranging from 1 month to 25 years were examined. For the identification of the C cells by Grimelius silver impregnation, toluidine blue, pseudoisocyanin and azur A stainings were employed. In the thyroid of the bison the C cells in the central region were distributed denser than in the peripheral region. They may particularly appear in great numbers in the interior of ultimobranchial (UB) remnants; in these cases, however, a great variety of changes has been observed. In part of the adults animals individual differences of the hyperplasia C cells in the preserved UB structures were observed: C cells have not been detected in the internal parathyroid glands. In the discussion, the meaning of paracrine has been described in autoregulatory mechanisms controlling the thyroid activity.
authors.affiliation: Anstalt für Histologie und Embryologie, Medizinische Akademie, Bialystok, Polen.
authors.forename: B
authors.initials: B
authors.lastname: Sawicki
mesh_terms: D000375:Aging / Q000502:physiology*; D000818:Animals; D016164:Bison / Q000033:anatomy & histology*; D005260:Female; D006706:Homeostasis; D008297:Male; D012621:Seasons; D013961:Thyroid Gland / Q000166:cytology* / Q000254:growth & development / Q000502:physiology; D014460:Ultimobranchial Body / Q000166:cytology* / Q000254:growth & development / Q000502:physiology
vernacular_title: C-Zellen in der Schilddrüse und in den Resten des Ultimobranchialkörpers des Wisents.