[Genesis of C-cells of the thyroid gland in Wistar rats].

Proliferation of the C cells of the rat thyroid gland under conditions of prolonged hypercalcemia induced with vit. D3 leading sometimes to a formation of adenoma-like nodules was observed. Metaplasia of the follicular epithelium into the C cells observed in the process of nodules formation seems to point out that the C cells and the follicular cells of the thyroid gland arise from a common maternal cell.