Abstract：
:The medial preoptic nucleus is a sexually dimorphic structure whose cytoarchitecture, afferent and efferent connections, and functions have been previously described. No detailed ultrastructural study has, however, been performed to date. Here we describe the ultrastructural organization of this important preoptic structure of the male quail. Neuronal cell bodies of the medial preoptic nucleus generally show extensive development of protein-synthesis-related organelles (rough endoplasmic reticulum, polysomes), and of secretory structures (Golgi complexes, secretory vesicles, dense bodies). Previous morphometrical studies at the light-microscopical level have demonstrated the presence of a medial and a lateral neuronal population distinguished by the size of their cell bodies (the medial neurons are smaller than the lateral neurons). The present ultrastructural investigation confirms the difference in size, but no difference has been observed in the ultrastructural organization of the neurons. In both the medial and the lateral part, the nucleus is characterized by a large variety of cell bodies, including some that, on the basis of their ultrastructure, can be considered as putative peptidergic neurons. Close contacts are frequently observed between adjacent cell bodies that are normally arranged in clusters. Various types of synaptic endings are also present, suggesting a rich supply of nerve fibers. A few glial cells are scattered within the nucleus. In view of the crucial role of this region in regulating quail sexual behavior, the large heterogeneity of neurons and of afferent nervous fibers suggest that this region might have an important role in the integration of information arriving from different brain regions.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Panzica GC,Spigolon S,Castagna Cdoi
10.1007/BF00318164subject
Has Abstractpub_date
1995-03-01 00:00:00pages
517-27issue
3eissn
0302-766Xissn
1432-0878journal_volume
279pub_type
杂志文章abstract：:Ornithine decarboxylase (ODC) activity was measured in homogenates of neonatal rabbit ovaries from the day of birth to day 22, an interval that corresponds to the progressing stages of the meiotic prophase from oogonia to diplotene and follicle formation. The ODC-activity was high on days 1 and 3 when most germ cells ...
journal_title：Cell and tissue research
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journal_title：Cell and tissue research
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journal_title：Cell and tissue research
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更新日期：1996-10-01 00:00:00
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更新日期：1980-01-01 00:00:00
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journal_title：Cell and tissue research
pub_type： 杂志文章
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更新日期：1978-07-27 00:00:00
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journal_title：Cell and tissue research
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journal_title：Cell and tissue research
pub_type： 杂志文章,评审
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更新日期：2013-10-01 00:00:00
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pub_type： 杂志文章
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