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  • Electron microscopy  (2)
  • Enteropneusta  (1)
  • 1975-1979  (1)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 107 (1970), S. 234-239 
    ISSN: 1432-0878
    Keywords: Stomochord ; Chorda dorsalis ; Enteropneusta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Das Stomochord von Harrimania kupfferi und Ptychodera flava, eine Ausbuchtung des Darmkanals der Enteropneusten, welche in das Präsoma hineinragt, besteht aus zwei Zelltypen: a) Epithelzellen, die durch Desmosomen verbunden sind und große Vakuolen besitzen; ihr distaler Zellsaum ist mit Mikrovilli und Zilien ausgestattet. b) Schleimzellen. An der Basis des Epithels kommen zahlreiche Nervenfasern vor, die Granula (Durchmesser etwa 1,500 Å) enthalten. Das Stomochord wird von einer Basallamina und Bindegewebsfasern umschlossen. Die Frage der Homologie des Stomochords mit der Chorda dorsalis wird diskutiert.
    Notes: Summary The stomochord of Harrimania kupfferi and Ptychodera flava. a tubular structure which extends from the oral cavity into the presoma, consists of two cell types: a) epithelial cells interconnected by desmosomes, which bear at their apical pole a brush-border and cilia. The largest part of these cells is occupied by a voluminous vacuole; b) mucus cells. In addition, at the base of the epithelium numerous nerve fibres occur, which are characterized by electron dense granules of about 1,500 Å diameter. The whole stomochord is surrounded by a basement lamina and connective tissue fibres. The question of homology between stomochord and notochord is discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0878
    Keywords: Turbellaria ; Receptors ; Epidermis ; Secretory cells ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Sinneskante des landlebenden Turbellars Bipalium kewense setzt sich aus folgenden Zellformen zusammen: Papillen und distaler Teil der Epithelfalten werden von einem versenkten Epithel bedeckt. Die distale Cytoplasmalage ist besonders dicht und durch ein tubuläres System gekennzeichnet, das offenbar aus dem Golgi-Apparat der Perikaryen hervorgegangen ist. Die Perikaryen sind tief versenkt und enthalten außer dem Kern granuläres ER, Mitochondrien, Golgi-Apparat und vor allem viel Glykogen. Die Epidermis ist zellig organisiert. In ihrem Bereich kommen drei Sekretzell-Formen vor, die ebenfalls weit in die unterlagernde Bindegewebs-Muskel-Lage hineinragen. Die Sinneskante ist durch zwei Receptor-Typen charakterisiert. Multipolare Zellen erreichen mit mehreren Dendriten die Körperoberfläche im Bereich der Papillen und dem äußeren Teil der Furchen des Kopfvorderrandes. Bipolare Zellen finden sich nur tief eingesenkt in den Sinnesgruben. In ihrem Bereich kommen keine Stützzellen vor. Außer durch die Gestalt sind beide Receptoren durch die Struktur ihrer Cilien unterschieden. Wabendesmosomen sind beiden gemeinsam.
    Notes: Summary The sensory border of the land-dwelling turbellarian Bipalium kewense consists of the following cell types: Papillae and distal part of the epithelial folds are covered by epithelial cells, the perikarya of which lie deeply below the basal lamina. Their distal cytoplasm is particularly dense and characterized by a tubular system, which obviously originates from the Golgi apparatus. The perikarya contain beside the nucleus mitochondria, rough endoplasmic reticulum, Golgi apparatus and above all numerous glycogen particles. Within this cellular epidermis three types of secretory cells occur which also penetrate deeply into the underlying layer of connective and muscle tissues. The sensory border is marked by two types of receptor cells. In the area of the papillae and in the outer part of the furrows of the anterior rim of the head, multipolar cells extend several dendrites to the body surface. Bipolar cells have been observed only in the depth of the sensory grooves. In their surroundings no supportive cells occur. Except for their shape the sensory cells differ in the structure of their cilia. Both cell types are interconnected with neighbouring cells by comb-desmosomes.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 177 (1977), S. 539-553 
    ISSN: 1432-0878
    Keywords: Sensory receptors ; Peripatopsis ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Three types of sensilla occurring on the lips and on the antennae of Peripatopsis moseleyi have been investigated by scanning and transmission electron microscopy. On the lips sensory spines can be found which contain numerous cilia originating from bipolar receptor cells. They reach the tip of the spine where the cuticle is modified. The perikarya of the sensory cells, a large supporting cell with a complicated surface and a second type of receptor, form a bud-like structure and are surrounded by a layer of collagen fibrils. The second receptor cell bears apical stereocilia as well as a kinocilium which are directed towards the centre of the animal — thus the cell appears to be turned upside down. The sensilla of the antennae are 1) sensory bristles containing two or three kinds of receptor cells, one of which bears an apical cilium and one kind of supportive cell and 2) sensory bulbs located within furrows consisting of receptor cells with branched cilia and two kinds of supportive cells which are covered by a modified thin cuticle. According to the electron microscopical findings the sensory spines on the lips are presumably chemoreceptors. The sensory bristles on the antennae can be regarded as mechanoreceptors and the sensory bulbs as chemoreceptors.
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