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  • 1
    Digitale Medien
    Digitale Medien
    Visual zone of the claustrum shows localizational and organizational differences among rat, guinea pig, rabbit and cat (1998)
    Springer
    Anatomy and embryology 198 (1998), S. 63-72 
    Details
    ISSN: 1432-0568
    Schlagwort(e): Key words Claustrum ; Visual cortex ; Visual zones Comparative anatomy ; Rat ; Guinea pig ; Rabbit ; Cat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The retrograde axonal transport method was used to compare the topography and organization of the visual zone of the claustrum in rat, guinea pig, rabbit and cat. First, massive Fluoro-Gold injections were placed into the primary visual cortex and the secondary areas. Experiments showed differences in the location of the visual zone among the animals under study. In rat, the visual zone occupied the posteroventral part of the claustrum and spread to its anterior pole. In guinea pig, neurons projecting to the visual cortex were located dorsally in the posterior half of the claustrum. In rabbit, similarly to the rat, they were localized in the posteroventral part; however, they did not reach the anterior pole. In cat, neurons that project to the visual cortex were concentrated dorsally in the posterior fourth of the claustrum. In double-injection experiments, Fast Blue and Diamidino Yellow were placed into the primary and secondary visual areas in various combinations. The experiments showed that in the rat and the rabbit claustral neurons project to primary visual cortex (area 17) as well as to both secondary visual areas (areas 18a and b). Populations of neurons sending axons to the primary and secondary areas showed full overlap. The presence of double-labeled neurons indicates that some claustral neurons project both to the primary and secondary fields. In cat, neurons that project to the primary visual cortex appear to be clearly separated from those connected with the secondary visual area, as no double-labeled neurons were found. In all studied species, the double injections placed into the visual and primary somatosensory cortex did not result in any double-labeling neurons. Our results indicate that the location of the visual zone in the posterior part of the claustrum is a phylogenetically stable feature, whereas its dorsoventral shift as well as the extent toward the anterior pole is related to the particular species. The overlap of neurons projecting to the primary and secondary visual areas in the rat and rabbit as well as the separation of both projections in cat appear to reflect the higher degree of complexity of the visual system in the latter.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004290050165
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  • 2
    Digitale Medien
    Digitale Medien
    Topography and dynamics of neurofibrillar degeneration in aluminum encephalopathy (1967)
    Springer
    Acta neuropathologica 9 (1967), S. 127-133 
    Details
    ISSN: 1432-0533
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Die Topographie und Dynamik der Neurofibrillendegeneration wurde an Kaninchen nach suboccipitaler, intracerebraler und intraspinaler Injektion von Aluminiumphosphat untersucht. Die frühesten Fibrillenläsionen wurden 48 Std nach Aluminium-Injektion nachgewiesen, während klinische Symptome einschließlich Paresen, Ataxie und epileptischer Krämpfe vom Grand Mal-Typ erst nach 7–8 Tagen auftraten. Die topische Verteilung der Läsionen zeigte daß: a) folgende Strukturen nach Aluminiumphosphat-Injektion konstant Neurofibrillenveränderungen aufweisen — Nuclei olivae sup., Nucl cochlearis ventralis, Nucl. gigantocellularis, Subst. grisea intermed., Nuclei mot. med. et lat. des Rückenmarks; b) in einigen Strukturen Neurofibrillenveränderungen nur bei einigen Fällen nachweisbar waren: Nucl. olivae inf., ventrobasaler Kernkomplex und limbischer Cortex; c) in folgenden Strukturen keine Neurofibrillendegenerationen nachzuweisen waren: Nucl. tractus mesencephalici n. trigemini, Nucl. vestibularis lat.Deiters.
    Notizen: Summary The topography and dynamics of neurofibrillar degeneration were studied in rabbits after suboccipital, intracerebral and intraspinal injection of aluminum phosphate. The earliest neurofibrillar lesions were observed 48 hours after the injections of aluminum, while clinical symptoms including paresis, ataxia and grand mal epileptic convulsions appeared after 7–8 days. The topographic distribution of the lesions showed that there are: a) structures which after injection of aluminum phosphate always exhibit neurofibrillar degeneration (nucl. olivae sup., nucl. cochlearis ventralis, nucl. gigantocellularis, subst. grisea interm., and nuclei mot. med. et lateralis of the spinal cord); b) structures in which neurofibrillar degeneration was observed only in some cases (nucl. olivae inf., ventrobasal complex, limbic cortex); c) structures in which neurofibrillar degeneration was not observed (nucl. tractus mesencephalici n. trigemini, nucl. vestibularis lateralis Deiters).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691437
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