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  • Priapulida  (2)
  • Adhesive digital pads  (1)
  • Enteropneusta  (1)
  • Notochord  (1)
  • Springer  (5)
  • 1970-1974  (5)
Collection
Keywords
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  • Springer  (5)
Years
  • 1970-1974  (5)
Year
  • 1
    Electronic Resource
    Electronic Resource
    The fine structure of the stomochord of the enteropneusts Harrimania kupfferi and Ptychodera flava (1970)
    Springer
    Cell & tissue research 107 (1970), S. 234-239 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00335227
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  • 2
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Untersuchung eines Mechanorezeptors von Evertebraten (Priapuliden, Oligochaeten) (1971)
    Springer
    Cell & tissue research 117 (1971), S. 226-234 
    Details
    ISSN: 1432-0878
    Keywords: Mechanoreceptors ; Epidermis ; Oligochaeta ; Priapulida
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Rezeptoren von Priapulus caudatus und Rhynchelmis limosella werden elektronenmikroskopisch untersucht. Ihre Strukturen stimmen in folgenden Merkmalen überein: Apikal steht eine Zilie, die von regelmäßig angeordneten Mikrovilli umgeben wird. Das Cytoplasma der Mikrovilli ist zentral verdichtet und im übrigen Bereich von Filamenten ausgefüllt, die im Perikaryon wurzeln. Im distalen Teil der Zelle liegt ein reich entwickeltes glattes E. R., darunter folgen Tubuli. Die Zellen werden reich innerviert. Aufgrund der strukturellen Übereinstimmung mit Mechanorezeptoren anderer Tiergruppen wird den Rezeptoren der untersuchten Formen ebenfalls eine mechanorezeptive Funktion zugeschrieben.
    Notes: Summary Epidermal receptor cells of Priapulus caudatus and Rhynchelmis limosella have been investigated with the electron microscope. The following structural peculiarities characterize these cells: an apical cilium is surrounded by regularly arranged microvilli, which contain filaments extending into the cytoplasm of the cell body. The central part of the microvilli is electron dense. The apical part of the cell contains abundant tubules of smooth E. R., below which microtubules are located. The cells are richly innervated. These elements are interpreted to represent mechanoreceptors because they have the above mentioned structures in common with mechanoreceptors of other invertebrate groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330739
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  • 3
    Electronic Resource
    Electronic Resource
    Fine structural and enzymehistochemical observations on the notochord of Ichthyophis glutinosus and Ichthyophis kohtaoensis (Gymnophiona, Amphibia) (1971)
    Springer
    Cell & tissue research 117 (1971), S. 443-450 
    Details
    ISSN: 1432-0878
    Keywords: Notochord ; Caecilians ; Histochemistry ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The notochord of Ichthyophis glutinosus and I. kohtaoensis consists of peripheral flattened cells characterized by a well-developed system of rough endoplasmic reticulum, bundles of tonofilaments, and abundant glycogen particles. These cells contain furthermore fairly high activities of α-naphtyl-acetate esterase and 4-chloro-5-bromoindoxyl acetate esterase as well as acid phosphatase which was found in lysosomal localization. The huge intracellular vacuoles of the centrally situated cells possibly originate from electron translucent spaces within the glycogen fields of the peripheral cells. The notochord sheath consists of variously differentiated layers of collagen fibers and of an elastica externa. The diameters of the collagen fibers increase from the inner towards the outer region of the sheath. A peculiar feature of the Ichthyophis notochord sheath is a ring of mineralized collagen. The notochord of the caecilians investigated is compared with that of anurans, urodeles, and several groups of fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324813
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  • 4
    Electronic Resource
    Electronic Resource
    The fine structure of the digital pads of rhacophorid tree frogs (1974)
    Springer
    Cell & tissue research 148 (1974), S. 407-416 
    Details
    ISSN: 1432-0878
    Keywords: Tree frogs ; Adhesive digital pads ; Transmission and scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The digital pads of three tree-frogs (genus Rhacophorus) have been studied by transmission and scanning electron microscopy. The distal parts of the outermost epidermal cells are separated by wide gaps. The surface of these cells is characterized by stout microvillus-like processes. The apical plasma membrane is reinforced by a layer of electron-dense material attached to its inner side. The cytoplasm contains bundles of tonofilaments extending into the apical cellular processes, numerous ribosomes and abundant granular and vesicular inclusions. In the connective tissue under the epidermis mucous glands — characterized by granule-containing, mitochondria-rich and smooth muscle cells — and an extensive nerve plexus occur. The latter innervates the mucous glands and in addition consists of sensory fibres which have been found in connection with lamellated sensory corpuscles. In respect of the degree of adaption towards a tree-dwelling life, the excluvisely tree inhabiting species (Rhacophorus reinwardti) appears to be particularly advanced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224267
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  • 5
    Electronic Resource
    Electronic Resource
    Über den Aufbau des Integumentes der Priapuliden und der Sipunculiden [Priapulus caudatus Lamarck, Phascolion strombi (Montagu)] (1970)
    Springer
    Cell & tissue research 105 (1970), S. 55-64 
    Details
    ISSN: 1432-0878
    Keywords: Priapulida ; Sipunculida ; Integument
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Epidermis von Priapulus caudatus besteht aus E. R.-reichen Zellen, deren chromatinarme Kerne apikal von zahlreichen Mitochondrien umgeben werden. Distal lagert eine dicke Kutikula, die aus feinfaserigem Material besteht. Die basale Plasmamembran ist zu einem umfangreichen Labyrinth aufgefaltet. Die Epidermis von Phascolion strombi weist nur wenig endoplasmatisches Retikulum auf. In den Zellen kommen viele Tonofilamentbündel vor. Das basale Plasmalemm ist aufgefaltet. Die Kutikula besteht aus vielen Schichten rechtwinklig gegeneinander versetzter Fibrillenlagen. Dieser ultrastrukturelle Bau einer Kutikula tritt sonst nur bei den Anneliden auf. Im Bereich der Tentakel findet sich keine Kutikula. Das Epithel ist hier mit einem Mikrovillussaum versehen und trägt an manchen Stellen Zilien.
    Notes: Summary The epidermis of Priapulus caudatus consists of cells with strikingly pale nuclei and an abundant granular endoplasmic reticulum. The apical parts of the nuclei are surrounded by dense clusters of mitochondria. The thick cuticle consists of fibrous material. The basal plasmalemma exhibits up-foldings that build up a labyrinthine system of intercellular spaces. The epidermis of Phascolion strombi which is poor in endoplasmic reticulum, is characterized by many bundles of tonofilaments. The basal plasmalemma exhibits simple up-foldings. The cuticle consists of layers of fibrils, which are orientated at right angles over each other. A similar cuticle has been found in the class of Annelids. In the area of the tentacles there is no cuticle, the epithelium bears microvilli and cilia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340564
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