[Autoradiography of the brain of bramblings (Fringilla montifringilla L.) following the injection of 3H-testosterone].
The topographic distribution of 3H-testosterone and/or its metabolites in brains of Bramblings (Fringilla montifringilla L.) was studied autoradiographically and the intensity of labeling was estimated semi-quantitatively. The highest accumulation of radioactivity was found in nuclei of the preoptic region and the hypothalamus (fig. 2--fig. 5). Cells of the Nucleus preopticus medialis (POM), Nucleus paraventricularis magnocellularis (PVM) and Nucleus lateralis hypothalami posterioris (PLH) showed medium or high intensity labelling, while cells of the Nucleus preopticus paraventricularis magnocellularis (PPM), Nucleus hypothalamicus anterior medialis (HAM), Nucleus hypothalamicus posterior medialis (HPM), and the infundibular area (TU) contained low or medium concentrations of radioactivity. The role of these nuclei in the gonadal feedback on the hypothalamo-hypophyseal system, in the control of the annual reproductive cycle and as effective sites of testosterone on sexual behaviour are discussed. Moderate accumulations of radioactivity were also observed in the Hyperstriatum ventrale of the telencephalon (HV, fig. 5), the Nucleus intercollicularis of the mesencephalon (ICo, fig. 6) and the Nucleus nervi hypoglossi (nXII) of the medulla. These structures are known to influence bird song and other vocalisations. Low labelled cells were found in the periventricular zone of the neostriatum, in the lateral septum, and more irregularly in other areas (fig. 1--6). The pattern of distribution of 3H-testosterone in the brain of Bramblings was similar to that in other birds (table 1).
D000818:Animals; D001717:Birds; D001921:Brain / Q000378:metabolism*; D001931:Brain Mapping; D004027:Diencephalon / Q000378:metabolism; D008297:Male; D008636:Mesencephalon / Q000378:metabolism; D013687:Telencephalon / Q000378:metabolism; D013739:Testosterone / Q000378:metabolism*
D013739:Testosterone
Autoradiographische Untersuchungen am Gehirn von Bergfinken (Fringilla montifringilla L.) nach Injektion von 3H-Testosteron.