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  • 1
    Electronic Resource
    Electronic Resource
    An electron microscopical study of the development of the teleost heart (1972)
    Springer
    Anatomy and embryology 139 (1972), S. 93-105 
    Details
    ISSN: 1432-0568
    Keywords: Teleost ; Heart ; Cardiogenesis ; Electron microscopy ; Development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An electron microscopic study has been made on the development of the heart of the plaice (Pleuronectes platessa L.) by the examination of tissue taken from fish at the stage when the heart-tube has formed right through the larval life and up two months postmetamorphosis. The process of developments of the heart is essentially the same as that in higher vertebrates but there are certain minor sequential differences with comparable chick tissue. By day 24 (ten days after hatching) the “early larval” heart has formed which is a trilaminar structure — a layer of myocardium bounded internally by endocardium and externally by epicardium. This condition lasts until the 4a (Ryland) stage with the onset of endocardial invagination into the myocardium which is the criterion distinguishing the “late larval” heart. The “late larval” heart lasts throughout metamorphosis of the larva and until two months post-metamorphosis when the total adult heart is assumed. Thus the process of cardiogenesis continues irrespective of hatching and of metamorphosis. This study supports the concept that the epicardium is derived from an extramyocardial source. No results are presented concerning the theory that, in its earliest stages, the myocardium has a secretory function in the production of cardiac jelly, or of myofibrillogenesis in the Teleost myoblast. Stellar configurations of short lengths of newly formed sarcomeres commonly radiate out from Z centres in early myocytes and it is suggested that this is a primitive feature of Teleost myogenesis. There is also a proliferation of mitochondria within the myocardial cells at metamorphosis which may be connected to the subsequent fast growth of the heart in the succeeding two months.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00520947
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of ageing on the histochemically demonstrable catecholamines in the hypogastric (main pelvic) ganglion of the rat (1980)
    Springer
    Journal of molecular histology 12 (1980), S. 527-535 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effect of ageing on adrenergic neurons was studied in the hypogastric ganglion of the male rat using the formaldehyde-induced fluorescence method. With age, two changes were obvious. Firstly, the fluorescence intensity of the neurons decreased throughout postnatal life and the number of completely non-fluorescent adrenergic neurons increased. Secondly, the amount of non-specific fluorescence due to lipofuscin pigment increased. The pigment fluorescence was also found around the neurons in satellite cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01011926
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution of NADPH-diaphorase activity in rat paravertebral, prevertebral and pelvic sympathetic ganglia (1993)
    Springer
    Cell & tissue research 271 (1993), S. 115-121 
    Details
    ISSN: 1432-0878
    Keywords: NADPH-diaphorase ; Sympathetic ganglia ; Hypogastric ganglion ; Autonomic nervous system ; Dehydrogenase histochemistry ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Paravertebral (superior cervical and stellate), prevertebral (coeliac-superior mesenteric, inferior mesenteric) and pelvic (hypogastric) sympathetic ganglia of the rat were investigated by enzyme histochemistry to ascertain the distribution of nicotinamide adenine dinucleotide phosphate diaphorase (NADPH-diaphorase) activity. In the paravertebral ganglia the majority of the sympathetic neuronal perikarya contained lightly and homogeneously distributed formazan reaction product but there was a range of staining intensities amongst the neuron population. In contrast, in the prevertebral ganglia, intense NADPH-diaphorase staining was present in certain neurons. Firstly, a population of neurons of the coeliac-superior mesenteric ganglion complex were surrounded by densely NADPH-diaphorase-positive ‘baskets’ of fibres and other stained fibres were seen in interstitial nerve bundles and in nerve trunks connected to the ganglion complex. Secondly, in both the inferior mesenteric ganglion and hypogastric ganglion there were many very intensely NADPH-diaphorase positive neurons. Stained dendritic and axonal processes emerged from these cell bodies. In both ganglia this population of neurons was smaller in size than the lightly stained ganglionic neurons and commonly had only one long (presumably axonal) process. The similarity of these highly NADPH-diaphorase-positive neurons with previously described postganglionic parasympathetic neurons in the hypogastric ganglion is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297549
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  • 4
    Electronic Resource
    Electronic Resource
    Sympathetic and sensory innervation of the urinary tract in young adult and aged rats: a semi-quantitative histochemical and immunohistochemical study (1994)
    Springer
    Journal of molecular histology 26 (1994), S. 127-133 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The sympathetic innervation of the urinary tract of young adult (4 months) and aged (24+ months) rats has been examined by glyoxylic acid-induced fluorescence for the detection of noradrenaline and by immunofluorescence using antisera against tyrosine hydroxylase (TH) and neuropeptide Y (NPY). Immunostaining for calcitonin gene-related peptide (CGRP), known to be present in pelvic sensory nerves, was also performed. Semi-quantitative estimations of nerve densities were made of noradrenergic and peptidergic fibres innervating the smooth musculature of the ureter, bladder and urethra, and of the urinary tract vasculature. In the aged rats the overall patterns of innervation remained unchanged. However, with the exception of the vesical vasculature, the density of noradrenergic innervation decreased as did the intensity of histofluorescence. A similar pattern of results was observed by TH and NPY immunofluorescence. The results present evidence for a diminution in the sympathetic control of the urinary tract in aged rats. The pattern and density of CGRP-immunoreactive nerves was unchanged in the aged animals suggesting that pelvic visceral sensory innervation is more resistant to the effects of advancing age.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157961
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  • 5
    Electronic Resource
    Electronic Resource
    Stability of enzymatic indicators of metabolic and neuronal activity in post-ganglionic neurons supplying the urinary tract of aged rats (1998)
    Springer
    Journal of molecular histology 30 (1998), S. 317-324 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Aged post-ganglionic neurons supplying the urinary tract exhibit stability in their metabolic and functional status, as demonstrated by quantification of enzyme histochemical reaction products. The major pelvic and thirteenth thoracic (T13) ganglia from 4- and 24-month-old male Wistar rats were incubated under standardized conditions to demonstrate succinate dehydrogenase, NADH-tetrazolium reductase and cytochrome oxidase activities. The amount of reaction product for each enzyme, localized in neuronal perikarya throughout the ganglia, was quantified by microdensitometry. Comparison of mean totals demonstrated stability of all three enzymes with age in both the major pelvic and T13 ganglia and in target organs. Also, the distribution and range of reaction product densities were similar. In both ganglia, the number of NADH-tetrazolium reductase-stained neurons per unit area was reduced in the aged animals. Additionally, nicotinic (DMPP) and muscarinic (McN-A-343) agonists were used to mimic the effects of preganglionic stimulation in the major pelvic ganglia before performing enzyme histochemical reaction. Quantification of these activities demonstrated that the response of aged neurons to preganglionic stimulation was unchanged. These results indicate an overall metabolic stability in post-ganglionic autonomic neurons innervating the urinary tract and in their targets in aged rats. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003276210046
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  • 6
    Electronic Resource
    Electronic Resource
    The organization of the sarcoplasmic reticulum in teleost ventricular myocardial cells (1974)
    Springer
    Cell & tissue research 151 (1974), S. 395-402 
    Details
    ISSN: 1432-0878
    Keywords: Heart ; Teleost ; Sarcoplasmic reticulum ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The morphology of the sarcoplasmic reticulum in myocardial cells of the ventricle of the trout heart is described as the result of an investigation with the electron microscope. The sarcoplasmic reticulum is sparse in distribution compared to that of birds or mammals but shows a fundamentally similar organization. A very loose network of fine tubules is in intimate contact with the myofibrils but with no local modification with respect to the arrangement of myofilaments within the sarcomeres. There is no special association of the sarcoplasmic reticulum with the Z-bands. Some tubules pass to the cell periphery where they expand to form subsarcolemmal cisternae in which electron-dense matter is often seen. The occurrence of the subsarcolemmal cisternae (peripheral couplings) is random and they are not observed in the vicinity of intercalated discs. The sarcoplasmic reticulum is discussed in relation to excitation-contraction coupling in teleost myocardial cells, and in comparison with that of other vertebrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224549
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