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  • 1
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The paired organ of Bellonci protrudes from the optic lobe of the giant Antarctic isopod, Glyptonotus antarcticus. It is linked to the cortex by a broad peduncle. No connection to the cuticle or “sensory pore organ” was found. A cluster of sensory-like cells forms two outer ciliary segments branching into numerous microvilli with microtubules. The putative sensory somata are irregular in shape and contain a very high density of glycogen granules. The two outer segments sprout from two pits of the soma in different directions, forming a right angle. Glial cells wrap around the sensory cells and also delimit lacunae into which bundles of microvilli project. These lacunae contain electron-dense granules of small size and with species-specific patterns. Lacunae and dense granules show features typical of a degeneration process in the sensory cells.This general morphology corresponds to the unilobular type of organ of Bellonci, known in other isopods; it differs from the plurilobular type with onion bodies found in other Crustacea.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 112 (1971), S. 166-187 
    ISSN: 1432-0878
    Keywords: Organ of Bellonci ; Crustacea ; Sphaeroma serratum ; Sensoriel organ ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Das Belloncische Organ von Sphaeroma serratum enthält Hauptzellen; ihr Zellkörper ist mit einem Außenglied ausgestattet, mit dem es durch ein Ciliargebilde verbunden ist. Das Außenglied setzt sich mit Bündeln sehr langer freier Mikrozotten in das Organlumen hinein fort. Der Zellkörper ist von flachen Saumzellen umgeben. Er enthält große, im Elektronenmikroskop dicht erscheinende Gebiete und zahlreiche Granula. Untersucht man diese mit cytochemischen Methoden der Licht- und Elektronenmikroskopie, so findet man die Charakteristika des Glykogens. Diese Substanzen werden in das Organlumen hinein abgegeben. Die Hauptzellen besitzen die Ultrastruktur sensorischer und nicht neurosekretorischer Zellen. Ihre Funktion könnte photorezeptorischer oder chemorezeptorischer Art sein. Diese Ergebnisse werfen die Frage auf, inwieweit es sich bei den sog. ‚'Belloncischen Organen“, die für die verschiedenen Crustazeengruppen beschrieben sind, um homologe Organe handelt.
    Notes: Summary The organ of Bellonci in Sphaeroma serratum comprises principal cells which consists of a cell body and an outer segment connected by a ciliary piece. The outer segment is prolonged by bundles of very long microvilli which are free in the central lumen, whereas the cell body is bounded by flat bordering cells. In the cell body there are large electron-dense spheres and a lot of granules, the latter appearing to be glycogen according to results obtained with light and electron microscopical cytochemical methods. These substances are released in the central lumen. The principal cells have not the fine structure of neurosecretory but of sensory cells. They may be photosensitive or chemosensitive elements. These results set the problem of the homology of the organs named “of Bellonci” seen in various groups of Crustacea.
    Type of Medium: Electronic Resource
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