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  • 1
    Electronic Resource
    Electronic Resource
    Direct contact between a neuron soma and myocardial cells; an electronmicroscopic finding in the sinus venosus of the turtle heart (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 179 (1974), S. 491-496 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Electron microscopy of the turtle sinus venosus shows an unusual neuron soma which is immediately surrounded by myocardial cells so as to form a somato-muscular complex. Studies of 36 sections cut through this neuron soma indicate that 27.4% of the somal surface studied is directly covered by cardiac muscle cells without any intervening basal lamina. Similarly, 18.8% of the somal surface studied is in contact with unmyelinated axons which at places make typical axosomatic synapses. A coupling of peripheral cisterns of the sarcoplasmic reticulum and the sarcolemma exists at the somato-muscular contiguity as well as at the border between cardiac muscle cells. It is suggested that neural influences upon the pacemaking activity of the turtle heart sinus can well be exerted through the somato-muscular pathway. Additionally, an axon which is presynaptic to the neuron soma has been observed to be simultaneously in a synaptic relation with a cardiac muscle cell; a remarkable deviation from the classical picture of the efferent nervous outflow to the heart.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1091790409
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  • 2
    Electronic Resource
    Electronic Resource
    Reciprocal synapses between cholinergic axons and small granule-containing cells in the rat cardiac ganglion (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 181 (1975), S. 195-209 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Electron microscopy of the rat cardiac ganglion shows occurence of small granule-containing cells that form reciprocal synaptic junctions with cholinergic terminals. At the synaptic junctions which are from axon to granule-containing cell, the intraaxonal vesicles are clustered against the junctional axolemma, but dense-cored vesicles in the postynaptic cell do not cluster towards the membrane densities in these synapses. By contrast, the synaptic zone polarized in the opposite direction shows an absence of axonal vesicles in close proximity to the postsynaptic axolemma, but there is a marked aggregation of dense-cored vesicles towards the presynaptic specializations of granule-containing cells. The synaptic zones are multifocal rather than bifocal, and the minimal distance separating each synaptic zone is about 0.3 μ. These findings may indicate that cholinergic excitation of some or all granule-containing cells causes a reciprocal inhibition of one or more cholinergic terminals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1091810204
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fine structural studies of the sino-auricular nodal tissue in the heart of a teleost fish, misgurnus, with particular reference to the cardiac internuncial cell (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 138 (1973), S. 407-429 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The sino-auricular nodal tissue of the heart of the loach (Misgurnus anguillicaudatus, Cantor) contains (1) myocardial cells receiving rich innervation, (2) isolated nerve cells, and (3) cardiac internuncial cells which are interposed between autonomic axon terminals and myocardial cells. Structural specializations are noted at the synapse between the autonomic axon and the myocardial cell, as well as at the axon-internuncial cell synapse. Between the internuncial cell and the myocardial cell, attachment plaques are present with a patchy locus of a close junction, wherein the extracellular space appears to be almost obliterated. Estimations were made of the surface areas of an internuncial cell body and a nerve cell body as revealed by serial sampling of the tissue at about 0.5 μ intervals. The results show that for an internuncial cell body followed over a length of 15 μ, 52.5% of its total surface is covered by vesiculated axons, 3.8% by non-vesiculated axons, 12.2% by myocardial cells, and 3.1% by Schwann cell processes; for a nerve cell body followed over a length of 16 μ, only 1.8% is covered by vesiculated axons, 0.5% by non-vesiculated axons, nil by myocardial cells, and 96.4% by a satellite cell and its processes. It is considered that the internuncial cell represents a specialized cell type in the nodal tissue of the fish heart, playing a role in modulating the autonomic nerve impulses before they are transmitted to the effector myocardial cells.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001380402
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    Paper (German National Licenses)
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