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  • Entorhinal cortex  (2)
  • CA3 pyramidal neurons  (1)
  • Dentate granule cells  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Organization of identified fiber tracts in the rat fimbria-fornix: an anterograde tracing and electron microscopic study (1996)
    Springer
    Anatomy and embryology 193 (1996), S. 481-493 
    Details
    ISSN: 1432-0568
    Keywords: Phaseolus vulgaris-leucoagglutinin ; Hippocampus ; Septum ; Entorhinal cortex ; Limbic system ; Fimbria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The fimbria is a major route for afferent and efferent fibers of the hippocampal formation. However, little is known about the intrinsic organization of the fimbria-fornix complex. In this study, the anterograde tracer Phaseolus vulgaris-leucoagglutinin (PHAL) was used to analyze the ultrastructure and topography of identified fiber tracts within the fimbria-fornix. Septo-hippocampal fibers are loosely distributed throughout the fimbria-fornix. Commissural fibers cross the midline in the ventral hippocampal commissure and form a tight fiber bundle in the fimbria. Crossed entorhino-hippocampal fibers cross the midline in the ventral hippocampal commissure rostral to the commissural fiber bundle, and crossed entorhino-entorhinal fibers pass through the dorsal hippocampal commissure. This suggests a topographical organization of fiber tracts within the fimbria-fornix that reflects the laminar organization of the hippocampal target structure: fibers of the diffusely terminating septohippocampal projection are loosely distributed throughout the fimbria-fornix, while those projections that are known to terminate in specific laminae of the hippocampal formation (commissural projection, crossed entorhino-hippocampal projection) form fiber bundles within the fimbria and the ventral hippocampal commissure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00185879
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of input synapses on intracellularly stained neurons in hippocampal slices: an HRP/EM study (1989)
    Springer
    Experimental brain research 75 (1989), S. 327-334 
    Details
    ISSN: 1432-1106
    Keywords: HRP-intracellular staining ; Hippocampal slice ; CA3 pyramidal neurons ; Dentate granule cells ; Input synapses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study describes the fine structure of input synapses on identified neurons in slices of the guinea pig hippocampus. For morphological identification, granule cells of the fascia dentata and pyramidal neurons of regio inferior of the hippocampus were impaled and intracellularly stained with horse-radish peroxidase (HRP). Input synapses on the HRP-stained neurons were identified in the electron microscope by the location of the synapses in inner or outer zones of the dentate molecular layer, as in the case of the synaptic contacts on injected granule cells, or by unique fine structural characteristics, as in the case of the giant mossy fiber boutons on CA3 pyramidal cells. As in tissue fixed in situ by transcardial perfusion, a large number of terminals arising from the different afferents in inner and outer zones of the dentate molecular layer were well preserved and formed synaptic contacts with small spines, large complex spines, and dendritic shafts of the HRP-filled granule cells. Mossy fiber synapses on the stained CA3 neurons were densely filled with clear vesicles, contained a few dense-core vesicles, and formed synaptic contacts with large spines or excrescences. Occasionally electrondense degenerating boutons were also found impinging on the stained dendrites and spines. The significance of the present findings for electrophysiological and pharmacological studies on brain slices is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00247938
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The alvear pathway of the rat hippocampus (1996)
    Springer
    Cell & tissue research 286 (1996), S. 293-303 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Phaseolus vulgaris leucoagglutinin ; Anterograde tracing ; Entorhinal cortex ; Crossed temporo-ammonic pathway ; Crossed temporo-dentate pathway ; Rat (Sprague Dawley)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Neurons of the entorhinal cortex project to the hippocampus proper and dentate gyrus. This projection is called the ”perforant pathway” because it perforates the subiculum; current usage applies this term to all entorhino-hippocampal fibers. However, entorhinal fibers also reach Ammon’s horn via the alveus (”alvear pathway”), an alternative route first described by Cajal. The anterograde tracer Phaseolus vulgaris leucoagglutinin (PHAL) was used in order to analyze the contribution of this pathway to the temporo-ammonic projection. In the temporal portion of the rat hippocampus, most of the entorhinal fibers reach Ammon’s horn after perforating the subiculum (classical perforant pathway). At more septal levels, the number of entorhinal fibers that take the alvear pathway increases; in the septal portion of the hippocampal formation, most of the entorhinal fibers to hippocampal subfield CA1 reach this subfield via the alveus. These fibers make sharp right-angle turns in the alveus, perforate the pyramidal cell layer, and finally terminate in the stratum lacunosum-moleculare. The crossed temporo-ammonic fibers reach their termination area in the stratum lacunosum-moleculare of CA1 almost exclusively via the alveus. These data indicate that the alveus is a major route by which entorhinal fibers reach their targets in CA1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050699
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    Paper (German National Licenses)
    Fulltext
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