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  • 1
    Electronic Resource
    Electronic Resource
    The pineal of the troglophilic fish,Chologaster agassizi: An ultrastructural study (1978)
    Springer
    Journal of neural transmission 43 (1978), S. 47-71 
    Details
    ISSN: 1435-1463
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The pineal of the facultative, cave-dwelling fish,Chologaster agassizi, was examined electron microscopically. Two cell types, photoreceptor and supportive cells, were identified in the pineal epithelium. The photoreceptor cells had well developed outer segments and contained Golgi bodies which were surrounded by both clear and dense-cored vesicles. Vesicle-crowned rods were frequently seen in various regions of the cell. The supportive cells also contained Golgi bodies from which both clear and dense-cored vesicles appeared to originate. In addition, these cells were characterized by peculiar arrangements of the smooth endoplasmic reticulum and the presence of pigment granules. Large quantities of glycogen were observed in both cell types. Small, unmyelinated nerve fibers were seen coursing throughout the pineal epithelium. Terminals filled with pleomorphic, clear vesicles and dense-cored vesicles were present in the vicinity of these nerve fibers. Similar vesicle-filled terminals were observed in close association with the supportive cells. The results of this study indicate that the pineal in this light-deprived species is a metabolically active organ capable of photoreception. Specializations of the organelles in the pineal cells were similar to those observed in other vertebrates living in environments of low light levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02029018
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Failure of medial forebrain bundle or raphe ablation to alter the daily temperature rhythm of the rat (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 1588-1589 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The data presented in the present study suggest that neither the ascending noradrenergic fibres confined to the MFB nor the serotonergic fibres originating in or passing through the mesencephalic raphe are essential for periodicity in body temperature. Both control and experimental groups, i.e., rats subjected to medial forebrain bundle or raphe ablation presented circadian periodicity in body temperature and neither the phase, amplitude or overall mean of experimentals differed significantly from controls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034691
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fine structure of the pineal organ in the troglobytic fish, Typhlichthyes subterraneous (Pisces: Amblyopsidae) (1978)
    Springer
    Cell & tissue research 195 (1978), S. 535-545 
    Details
    ISSN: 1432-0878
    Keywords: Pineal organ ; Troglobytic fish, Typhlichthyes subterraneous ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pineal organ of the blind, cave-dwelling fish, Typhlichthyes subterraneous, was examined with both light and electron microscopes. Like the eyes, the pineal in this troglobytic species was found to be regressed. Two cell types, photoreceptor and supportive cells, were described in the pineal epithelium. Although ganglion cells were not identified, small, unmyelinated nerve fibers were present. The photoreceptor cells had degenerated outer segments. Accordingly, it was suggested that the pineal in this species is not likely to function in photoreception. However, the presence of well developed Golgi bodies, clear and dense-cored vesicles, variable amounts of rough endoplasmic reticulum and glycogen particles indicated that both cell types are metabolically active and may play a role in secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233895
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    Paper (German National Licenses)
    Fulltext
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