Abstract:
:The cytoarchitecture and neuronal morphology of the torus semicircularis in the red-eared turtle, Chrysemys scripta elegans, were examined in Nissl-stained and Golgi-impregnated material. The torus semicircularis begins in the caudodorsal mesencephalon and extends rostrally and laterally to end ventrally to the tectal ventricle. The torus semicircularis consists of a central nucleus and a laminar nucleus, which is interposed between the central nucleus and the ventricle. The central nucleus can be divided into two regions, a small, large-celled area, located dorsally, and a larger area of small spherical (6-17 μm), large spherical (18-25 μm), triangular (15-27 μm) and fusiform (10-26 μm) neurons. The small spherical cells have two dendritic patterns: "radiate" and "single." The radiate pattern has a dorsoventral orientation, several secondary branches and few dendritic spines. These cells are usually located in the center of the central nucleus. The single pattern is oriented mediolaterally. This cell type is most often observed at the periphery of the central nucleus. These neurons have few secondary branches and dendritic spines. The large spherical neurons display two dendritic orientations: dorsoventral and mediolateral. All dendritic trees have numerous secondary branches and few dendritic spines. The triangular neurons exhibit primary dendrites projecting from the corners of the somata and have few secondary branches and dendritic spines. The fusiform neurons have a majority of their dendrites oriented mediolaterally, few secondary branches and a small number of dendritic spines. The laminar nucleus consists of several layers and three cell types: ovoid (9-15 μm), triangular (20-40 μm), and fusiform (20-40 μm). All neurons have few secondary dendritic branches and few dendritic spines. The dendrites of many neurons course perpendicularly to the long axis of the brainstem and encapsulate the central nucleus. Some ovoid and fusiform neurons display dendrites that enter the central nucleus.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Browner RH,Kennedy MC,Facelle Tdoi
10.1002/jmor.1051690207subject
Has Abstractpub_date
1981-08-01 00:00:00pages
207-223issue
2eissn
0362-2525issn
1097-4687journal_volume
169pub_type
杂志文章abstract::Complete postorbital bars, bony arches that encompass the lateral aspect of the eye and form part of a circular orbit, have evolved homoplastically multiple times during mammalian evolution. Numerous functional hypotheses have been advanced for postorbital bars, the most promising being that postorbital bars function ...
journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2005-06-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
pub_type: 杂志文章
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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更新日期:2008-09-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2005-05-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051570107
更新日期:1978-07-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2020-02-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051780203
更新日期:1983-11-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1993-12-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1993-04-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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journal_title:Journal of morphology
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更新日期:1996-02-01 00:00:00
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