Effects of steroid hormones on the neuropil of the hypothalamic paraventricular nucleus of male chickens |
| |
Authors: | Dr. G. C. Panzica G. Malacarne A. De Bernochi C. Viglietti-Panzica |
| |
Affiliation: | (1) Institute of Histology and General Embryology, School of Medicine, Italy;(2) Department of Animal Biology, Faculty of Sciences, University of Torino, Italy;(3) Istituto di Istologia ed Embriologia generale. C. so M.D.'Azeglio, 52 1-10126 Torino, Italy |
| |
Abstract: | Summary Testosterone and corticosterone, administered in doses of 0.5 mg/day for two weeks to three-day-old male chickens, induced alterations in the distributional pattern and in the number of synapses in the rostral neuropil of the hypothalamic paraventricular nucleus. This avian nucleus is a target area for both above-mentioned hormones and also one of the most important centers involved in the regulation of behavioral patterns related to reproduction. Testosterone increased the number of synapses in the rostral paraventricular nucleus, while corticosterone altered their distributional pattern causing an increase in type-B terminals; according to morphological criteria the latter are regarded to represent aminergic endings. Similar results were induced by simultaneous administration of both testosterone and corticosterone. Precocious sexual behavior was also provoked by double treatment.Preliminary results have been presented on the occasion of the 5th ENA meeting (Liège, Belgique, Sept. 1981) and the 1st Italian Meeting of Cell Biology (Rimini, Italy, April 1982)This study was supported by CNR bilateral grants (82.00215.04 & 83.00492.04), MPI 40% and European Training Program in Brain and Behaviour Researchs (twinning grant) |
| |
Keywords: | Testosterone Corticosterone Paraventricular nucleus Synapses Precocious sexual behavior Chicken |
本文献已被 SpringerLink 等数据库收录! |
|