A critical period for estrogen action on neurons of the song control system in the zebra finch.
AUTOR(ES)
Konishi, M
RESUMO
The song nuclei of the male zebra finch (Poephila guttata) contain larger neurons than those of the female. This gender difference arises after hatching as a result of cell atrophy in the female and cell growth in the male. Implantation of estrogen in female chicks induces masculine differentiation of neurons in their song nuclei. The effects of estrogen on neuron size decline steeply after posthatching day 35 when neuronal atrophy begins. Estrogen loses its masculinizing effects completely after day 45 when the adult level of neuronal atrophy is reached. Thus, the end and the intensity of hormone action appear to be correlated with the timing of neuronal atrophy.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=282108Documentos Relacionados
- Song-selective auditory circuits in the vocal control system of the zebra finch.
- Developmental changes in estrogen-sensitive neurons in the forebrain of the zebra finch.
- Growth and atrophy of neurons labeled at their birth in a song nucleus of the zebra finch.
- Two separate areas of the brain differentially guide the development of a song control nucleus in the zebra finch.
- Estrogen-inducible, sex-specific expression of brain-derived neurotrophic factor mRNA in a forebrain song control nucleus of the juvenile zebra finch
