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  • 1
    Electronic Resource
    Electronic Resource
    Die Ästheten vonAcanthochiton fascicularis (Mollusca, Polyplacophora) (1979)
    Springer
    Zoomorphology 92 (1979), S. 95-106 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Im Gegensatz zu allen anderen bisher untersuchten Polyplacophorenarten hatAcanthochiton fascicularis L. zwei Typen von Ästheten in den Schalenplatten. Im medianen Trakt gleichen sie den bisher bekannten Formen, in den lateralen Feldern sind sie extrem klein. Hier hat der stark entwickelte Gürtel das Tegmentum zurückgedrängt; dieses bildet in diesem Bereich um jeden Ästheten eine säulenstumpfartige Erhebung. Die beiden Ästhetentypen sind in ihrem Aufbau ähnlich: keulenförmige Sekretzellen und dünne Zentralzellen nehmen den meisten Raum in diesen Organen ein. Meist zweigen seitlich einige wenige Mikrästheten nach oben hin ab. Diese unterscheiden sich bei den beiden Ästhetentypen stark in ihrer Feinstruktur. Vor allem differieren die zwei Typen in ihren Sehzellen, die seitlich im Ästheten liegen. Median sind es rhabdomere Sehzellen, wie sie alle anderen bisher untersuchten Arten aufweisen, lateral hingegen ciliäre „Lamellenzellen“.
    Notes: Summary In contrast to all other investigated species the polyplacophoranAcanthochiton fascicularis L. has two types of aesthetes in their shell plates. Those which are situated in the median part of the shells are of a normal size and shape, whereas the aesthetes in the lateral fields are the smallest hitherto known. Here the tegmentum is repressed by the exuberantly developed girdle and forms trunklike structures around every aesthete. On the whole both aesthete types are similar: clubshaped secretory cells and thin central cells fill most of the organ. Up to a few micraesthetes may branch from the main part towards the shell surface. But there are also marked differences. In the median aesthetes rhabdomeric visual cells are present; in the lateral ones they have become ciliary “lamellate cells” which are probably also active photoreceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00999837
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  • 2
    Electronic Resource
    Electronic Resource
    Die Mantelpapillen und Stacheln vonAcanthochiton fascicularis L. (Mollusca, Polyplacophora) (1980)
    Springer
    Zoomorphology 94 (1980), S. 121-131 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Struktur und Ultrastruktur der Papillen im Mantelepithel der PolyplacophoreAcanthochiton fascicularis werden beschrieben. Sie bestehen zu einem gro\en Teil aus Sekretzellen. In vielen Papillen sind Sehzellen vorhanden. Die Papillen bilden einen bis mehrere Stacheln aus. Ein organischer Becher verbindet den Kalkstachel mit einer Stachelzelle, hÄufig noch mit einer zweiten Zelle, die distal eine Cilie trÄgt. Sie sind Tastrezeptoren. Andere Stacheln dienen lediglich der Abwehr; sie können durch Muskeln bewegt werden. Diese Stacheln wachsen stÄndig basal nach, wÄhrend die Taststacheln nach einiger Zeit abgesto\en und durch neu von der Papille gebildete ersetzt werden. Ästheten und Mantelpapillen sind homologe Orgame.
    Notes: Summary Structure and ultrastructure of the papillae in the mantle epithelium of the polyplacophoranAcanthochiton fascicularis are described. They consist to a major part of various secretory cells. Visual cells occur frequently in the papillae. Each of these organs form up to a few spines which have basally a cup of organic material. This connects the calcareous spine with the spine cell and often with a second cell which has distally one cilium. They are tactile receptors. Other spines are only for the defense and can be moved by muscles. They continue to grow basally in contrast to the tactile spines which are pushed off after some time and replaced by new ones formed in the papillae. The aesthetes and the mantle papillae are homologous organs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081929
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  • 3
    Electronic Resource
    Electronic Resource
    The chiton gill: Ultrastructure in Chiton olivaceus (Mollusca, Polyplacophora)Dedecated to Prof. M. Renner on the occasion of his 70th birthday. (1990)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 204 (1990), S. 75-87 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Gills of Chiton olivaceus, a primitive mollusc, are relatively simple in their structure and ultrastructure but are well adapted to a life in the intertidal zone. In contrast to some other molluscs, there is no differentiation of the gill epithelium into functional regions other than respiratory ones. Ciliation of the epithelium in certain areas may optimize water flow from the outer to the inner part of the mantle cavity. The hemolymph sinuses are oriented so that hemolymph flows in the opposite direction. Interstitial cells link epithelial cells with nerve endings. Muscle cells as well as the collagenous matrix in the connective tissue differ within the main gill axis and the lateral lamellae. The life cycle of immunoactive cells within the connective tissue and the hemolymph is described.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1052040109
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  • 4
    Electronic Resource
    Electronic Resource
    Morphological gradients in the starling basilar papilla (1992)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 213 (1992), S. 225-240 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The starling cochlea was studied with TEM at four locations along the basilar papilla to investigate gradients in morphological features over the papilla's length and width. Hair cell shape changes continuously from neural to abneural and from basal to apical. Unlike the situation in mammals, there are no distinct populations of hair cells; the previously described types (tall hair cells and short hair cells) are merely extremes in a continuum. Contacts between THC are a normal feature. Except at the base of the papilla, SHC have very large cuticular plates, suggesting a micromechanical function for these cells. In contrast to the THC, the SHC normally completely lack afferent innervation; this indicates that their function is restricted to within the basilar papilla itself. © 1992 Wiley-Liss, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1052130207
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  • 5
    Electronic Resource
    Electronic Resource
    Cochlear and lagenar ganglia of the chicken (1994)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 220 (1994), S. 71-83 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Cochlear and lagenar components of the statoacoustical ganglion in the inner ear of one chicken were studied quantitatively in the TEM. Both myelinated and unmyelinated nerve fibers were present in these two parts of the ganglion and in a putative efferent bundle within the ganglion. The cochlear portion had the lowest, the efferent bundle the highest percentage of unmyelinated fibers. Compared to the other parts of the ganglia, the cochlear fibers had a high degree of homogeneity, especially in fiber size. Some gradients in the baso-apical direction were found, such as an increase in the size of myelinated cochlear fibers from the base to the apex. Based on the ultrastructure of cellular components, no distinct populations of cell bodies within the statoacoustical ganglion were definable.The ganglion contained some 8,000 cochlear and about 1,200-2,000 lagenar neurons. The putative efferent bundle had only 150-200 fibers. This cannot be the total number of efferents to the hair cells in both the basilar papilla and the lagena. A large number of efferent fibers to the auditory papillae presumably run mingled among the afferent fibers. © 1994 Wiley-Liss, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1052200107
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