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  • 1
    Electronic Resource
    Electronic Resource
    Septal innervation of mossy cells in the hilus of the rat dentate gyrus: an anterograde tracing and intracellular labeling study (1997)
    Springer
    Experimental brain research 114 (1997), S. 423-432 
    Details
    ISSN: 1432-1106
    Keywords: Key words Fascia dentata ; Mossy cells ; Interneurons ; Lucifer yellow ; Phaseolus vulgaris leucoagglutinin ; Septohippocampal projection ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Mossy cells in the hilus of the rat dentate gyrus are the main cells of origin of the dentate commissural and associational projections. They project along the septotemporal axis of the dentate gyrus and may thus influence the hippocampal signal flow in a longitudinal direction. To analyze the septal innervation of these hilar neurons, anterograde tracing with Phaseolus vulgaris leucoagglutinin (PHAL) was used in combination with intracellular labeling of mossy cells (Lucifer yellow). Anterogradely labeled septal fibers impinge on proximal and distal dendrites of hilar mossy cells but spare the cell body. In contrast, numerous aspiny hilar neurons, presumably GABAergic interneurons, receive a septal innervation on their somata and proximal primary dendrites. These data demonstrate that septal fibers show a specificity for the dendritic segments of hilar mossy cells. Since mossy cells project predominantly to adjacent hippocampal lamellae, the activity of adjacent portions of the dentate gyrus may be influenced by the septal input onto these neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00005651
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Local circuit neurons in both the dentate gyrus and Ammon's horn establish synaptic connections with principal neurons in five day old rats: a morphological basis for inhibition in early development (1989)
    Springer
    Experimental brain research 78 (1989), S. 1-9 
    Details
    ISSN: 1432-1106
    Keywords: Inhibition ; Hippocampal formation ; Development ; GABAergic neurons ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Glutamate decarboxylase (GAD)-positive and Golgi impregnated local circuit neurons of the hippocampal formation of five day old rats were examined in light and electron microscopic preparations. The ultrastructural features of these neurons were similar in both the dentate gyrus and CA1 area of Ammon's horn. Somata displayed a perikaryal cytoplasm rich in organelles but lacked organized Nissl bodies. Most nuclei showed intranuclear infoldings of varying degrees but no intranuclear sheets or rods were found. Somata and dendrites were contacted by relatively immature axon terminals that formed mainly symmetric synapses. The axons of local circuit neurons in both the dentate gyrus and Ammon's horn formed symmetric synapses with somata and dendrites of the principal neurons in these regions. Thus, both GAD-positive and Golgi-impregnated terminals of local circuit neurons were observed to form synapses with pyramidal and granule cells. These terminals were usually small and contained relatively few pleomorphic synaptic vesicles. The results show that a circuitry for inhibition is established in the 5 day old dentate gyrus and Ammon's horn, even though the local circuit neurons lack some of the typical adult ultrastructural features at this age.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230680
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Mossy fiber synapses on glutamate decarboxylase-immunoreactive neurons: evidence for feed-forward inhibition in the CA3 region of the hippocampus (1989)
    Springer
    Experimental brain research 75 (1989), S. 441-445 
    Details
    ISSN: 1432-1106
    Keywords: Hippocampal mossy fibers ; GABAergicneurons ; GABAergic inhibition ; EM immunocytochemistry ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Mossy fibers are known to form excitatory synapses on pyramidal neurons in regio inferior of the hippocampus. This study demonstrates that the mossy fibers also establish synaptic contacts with glutamate decarboxylase-immunoreactive, supposedly GABAergic inhibitory neurons in the CA3 region. The observed connection provides a morphological basis for feed-forward inhibition of the pyramidal cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00247950
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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