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  • Epidermis  (2)
  • Integument  (2)
  • Caecilians  (1)
  • Cell & Developmental Biology  (1)
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  • 1
    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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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Untersuchungen über die Sinneskante des terricolen Turbellars Bipalium kewense Moseley (Tricladida) (1972)
    Springer
    Cell & tissue research 133 (1972), S. 267-275 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307147
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  • 4
    Electronic Resource
    Electronic Resource
    Über die Regeneration des Integumentes aus Zellen im Ventralnervenstrang von Phascolion strombi (Montagu) (Sipunculida) (1970)
    Springer
    Cell & tissue research 110 (1970), S. 258-267 
    Details
    ISSN: 1432-0878
    Keywords: Sipunculids ; Regeneration ; Integument
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Zellen des Regenerationsstranges im Bauchmark von Phascolion strombi sind in erster Linie durch elektronendichte Einschlüsse gekennzeichnet, deren Durchmesser etwa 5000 Å betragen. Bei Introvertamputation wandern diese Zellen nach vorn und bilden eine kolbenförmige Gewebemasse. Die rundlichen Einschlüsse lösen sich auf, werden zu Fasern umgebildet und aus den Zellen in das Interstitium geschleust. Diese Wanderstadien der Regenerationszellen sind durch sehr viele Glykogenrosetten und Lipideinschlüsse gekennzeichnet. Im weiteren Verlauf entstehen zwischen den distalen Zellen des Regenerates Desmosomen. Über den mit Mikrovilli versehenen Zellapices bildet sich die Kutikula, die offenbar den Sekreteinschlüssen der Regenerationszellen entstammt. Im jungen Epithel fehlen die für Regenerationsstrang und Wanderstadien typischen Einschlüsse, sein Zytoplasma ist reich an granulärem endoplasmatischen Retikulum. Die neue Muskulatur entsteht aus Amöbozyten.
    Notes: Summary The cells of the regeneration string in the ventral nerve cord of Phascolion strombi are in particular characterised by electron dense granules of 5000 Å in diameter. Following amputation of the introvert these cells migrate anteriorly and form a clublike mass of tissue. At this stage they are strikingly rich in glycogen and lipid. The globular inclusions dissolve and transform into fibers which are extruded from the cell into the interstitial space. At later phases of development desmosomes form between the distal cells of the regenerative tissue. On top of the microvilli bearing apical cell poles a cuticle develops, obviously arising from the secretion granules of the regeneration cells. The new-formed epithelium lacks inclusion bodies which are typical for the regeneration string and the migrating cells, instead its cytoplasm is rich in rough E. R. profiles. The musculature is built up by amebocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335530
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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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  • 6
    Electronic Resource
    Electronic Resource
    Scanning and transmission electron microscopic observations on the stomach of three mysid species (Crustacea) (1989)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 200 (1989), S. 17-27 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Epithelial and cuticular linings of the stomach investigated in three species representing different genera of the Mysidacea are elaborated into a set of structural specializations dividing the stomach longitudinally into one dorsal and two ventral channels. The dorsal, or food, channel contains ingested food and retains coarse particles, which eventually are transported into the midgut through a funnel. The ventral, or filtration, channels, which are separated by an anterior and a posterior median ridge (anteromedianum, inferomedianum), contain fine particles and soluble materials extracted from the dorsal channel through two filter systems: primary filters, which lie anteriorly on either side of the anteromedianum, and posterior secondary filters, which are located on the inferomedianum. The final filtrate is transported into the ventral caeca or midgut glands. The ultrastructure of the cuticle lining the lumen of the stomach shows several specializations, the most prominent of which are stout spines and delicate filter devices. The epithelium is multilayered in circumscribed areas (the lateralia). The basement lamina is extremely developed in the inferomedianum. Detailed knowledge of the microscopic anatomy and the ultrastructure of the stomach allows identification of several homologous gastric structures among different peracaridean groups and in Decapoda.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1052000104
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