Neurogenesis in the olfactory tubercle and islands of Calleja in the rat.

Neurogenesis in the rat olfactory tubercle and islands of Calleja was examined with [(3)H]thymidine autoradiography. Animals in the prenatal groups were the offspring of pregnant females given an injection of [(3)H]thymidine on two consecutive gestational days. Ten groups of embryos (E) were exposed to [(3)H]thymidine on E12-E13, E13-E14 4 E21-E22, respectively. Three groups of postnatal animals (P) were given four consecutive injections of [(3)H]thymidine on P0-P3, P2-P5, and P4-P7, respectively. On P60, the percentage of labeled cells and the proportion of cells originating during either 24 or 48 h periods were quantified at several anatomical levels. Three populations of neurons were studied: