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  • 1
    Electronic Resource
    Electronic Resource
    New aspects of the intrafilamental vascular system in gills of a euryhaline teleost, Tilapia mossambica (1973)
    Springer
    Cell & tissue research 144 (1973), S. 573-583 
    Details
    ISSN: 1432-0878
    Keywords: Gills ; Tilapia mossambica ; Blood vessels ; Arteriovenous anastomoses ; Light microscopy ; Quantitative evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The non-respiratory vascular system of T. mossambica gill filaments was studied in serial longitudinal and cross sections. Comparatively few scattered vascular communications occur between the afferent filament artery and the central venous sinus (AVAaff). The efferent filament artery, however, is connected by regularly arranged anastomoses (AVAeff), directly, and sometimes indirectly via nutritive vessels, to the central sinus. These AVAeff are about as numerous as lamellae counted on one side of each filament, although they diminish slightly in number towards the filament base. The relation AVAeff to AVAaff was 17.6:1 in the distal and 17.8:1 in the basal filamental region, while in the tip region of 7 filaments 126 AVAeff but only 1 AVAaff were encountered. No direct connection between the lamellar lacunae and the central sinus was detected. According to these results, non-respiratory intrafilamental blood shunting appears unlikely. AVAeff are assumed to be the main route for blood entering the central venous sinus which would consequently flow into the branchial veins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307382
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  • 2
    Electronic Resource
    Electronic Resource
    Arterio-venous anastomoses in rainbow trout gill filaments (1976)
    Springer
    Cell & tissue research 167 (1976), S. 373-385 
    Details
    ISSN: 1432-0878
    Keywords: Gills ; Salmo gairdneri ; Specialized endothelia ; Arteriovenous anastomoses ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The origin of arterio-venous anastomoses, connecting the efferent filament artery (EFA) with the central venous sinus (CVS) of gill filaments can be well discerned by scanning electron microscopy in the rainbow trout. Corresponding vessels between the afferent filament artery and the CVS could not be detected with the techniques applied. AVA-specific endothelial cells are characterized by their bulky shape and their microvillous surface. The general morphology of AVA's in Salmo gairdneri is very similar to that of AVA's in Tilapia mossambica (Vogel et al., 1974) but they are much longer in the trout. No filament whorls have been encountered in AVA endothelia of Salmo gairdneri.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219149
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructural study of arterio-venous anastomoses in gill filaments of Tilapia mossambica (1974)
    Springer
    Cell & tissue research 155 (1974), S. 491-512 
    Details
    ISSN: 1432-0878
    Keywords: Gills ; Tilapia mossambica ; Arterio-venous anastomoses ; Specialized endothelia ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Arterio-venous anastomoses (AVA) in gill filaments of Tilapia mossambica exhibit a distinct polarity. Two different types of highly specialized endothelial cells, both of epitheloid shape, line these vessels: Type I cells, contacting the arterial lumen, are elongated and about two to three times as large as type II endothelial cells. Their surface is increased by tentacular protrusions which reach far into the arterial lumen. Filament whorls forming tubelike structures with centrally located glycogen granules are abundant in these cells. Type II endothelial cells are located proximal to the central venous sinus (CVS). Their less abundant and more electron dense cytoplasm is free of filament whorls. There are also intermediate cell forms at approximately the middle of each anastomosis. Short cell processes protrude from all endothelial cell types into the AVA lumen. Outside the indistinct vascular basement lamina, a layer of cover cells tightly envelopes the AVA. These cells are, however, absent around the part of the AVA adjacent to the CVS. Here the endothelial cells are in immediate contact with the interstitium. Endothelial cells sheathed by cover cells reach the interstitium through basal foot processes. Nerve fibre bundles regularly come into close contact with the AVAs. Possible functions of the AVAs, including osmoreception are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227011
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