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  • Impulse conducting system  (2)
  • Impulse Conducting Tissue  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 137 (1972), S. 114-124 
    ISSN: 1432-0568
    Keywords: Heart ; Impulse conducting system ; Golden hamsters ; Mice ; Shrews
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Reizleitungssystem (RLS) von Goldhamster, Maus und Ratte wird färberisch-lichtmikroskopisch untersucht. 1. Bei allen species besteht das RLS aus Sinusknoten und Atrioventricularsystem (AV-Knoten,-Bündel, linker und rechter Kammerschenkel mit Endaufzweigungen), die sich prinzipiell nicht von denen anderer Säuger unterscheiden. 2. Histologisch ist das RLS sämtlicher Arten außerordentlich muskelfaserreich bzw. bindegewebsarm und ähnelt vor allem bei Goldhamster und Maus stark der Arbeitsmuskulatur. — Eine Bindegewebsscheide im Gebiet des AV-Systems ist besonders deutlich bei den Spitzmäusen ausgeprägt. — Eine spezielle Gefäßversorgung kommt nur im Sinus-und AV-Knoten von Goldhamster und Mäusen vor. 3. Regionale Unterschiede finden sich bevorzugt innerhalb des AV-Systems von Gold-hamster und Maus, weniger bei Spitzmäusen. 4. Artspezifische Differenzen existieren zwischen dem RLS von Goldhamstern und Mäusen einerseits und dem der Spitzmäuse andererseits. 5. Verglichen mit dem RLS größerer Säuger ist das von Goldhamster, Maus und Spitzmaus wesentlich kompakter und dem Myokard abschnittsweise weitgehend gleich gebaut. Dies dürfte zusammen mit der geringen Größe der Hauptgrund für die Schwierigkeiten sein, das RLS bei den genannten Arten sicher zu lokalisieren.
    Notes: Summary The impusle conducting system (ICS) of golden hamsters, mice and shrews was investigated by means of light microscopy. 1. The ICS of all species mentioned consists of a sinatrial node and an atrioventricular system (AV node, bundle, left and right limb, terminal branchings) in principal not differing from those in other mammals. 2. Histologically the ICS of golden hamsters, mice and shres is conspicuously rich in mucsle fibres respectively poor in connective tissue and rather similar to the myocardium, especially in the heart of golden hamsters and mice.—In the region of the AV system of shrews a connective tissue sheath is well developed.—A special blood supply can only be observed in the sinatrial and AV node of golden hamsters and mice. 3. Regional differences preponderantly exist within the AV system of golden hamsters and mice; in shrews its structure seems to be more homogenous. 4. Species-dependant differences can be found between the ICS of golden hamsters and mice on the one and that of shrews on the other side. 5. In comparison with that of bigger mammals the ICS of golden hamsters, mice and shrews is characterized by compact arrangement of its muscle fibres and striking histological similarity with the working myocardium which might be—together with the small size—the main reason for the difficulties to localize the ICS in the heart of these species exactly.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 323 (1971), S. 173-181 
    ISSN: 1432-2013
    Keywords: Shrew ; Heart ; Electrocardiogram ; Impulse Conducting Tissue ; Spitzmaus ; Herz ; Elektrokardiogramm ; Reizleitungssystem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The impulse conducting system (ICS) in the heart of the Asian musk shrew,Suncus murinus, was investigated by means of electrocardiography and light microscopy. In contrast to recent results denying an ICS in this species there exists a physiologically and morphologically well defined conductile tissue not differing from that in other mammals. Recognizable and typical EGGs were obtained with a P wave, PQ interval, QRS complex, and T wave. In accordance with the electrocardiographical pattern, anatomical examination revealed an ICS consisting of a SA node, AV node, AV bundle and ventricular Purkinje system (limbs and terminal branches). Histologically the specific tissue differs from the working myocardium by having fewer myofibrils, mitochondria, and blood vessels. Moreover the AV system is partially surrounded by a connective tissue sheath.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 115 (1971), S. 587-592 
    ISSN: 1432-0878
    Keywords: Heart ; Impulse conducting system ; Golden hamster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Histologisch, enzymhistochemisch und mit Hilfe formaldehyd-induzierter Fluoreszenz wird im rechten Vorhof des Goldhamsterherzens Reizleitungsgewebe nachgewiesen, das weder zum Sinus- noch zum AV-Knoten gehört. Dieses Gewebe gleicht in Struktur, Stoffwechsel, Vaskularisation und Innervation der übrigen Reizleitungsmuskulatur. Die funktionelle Bedeutung des zusätzlichen Knotengewebes wird diskutiert.
    Notes: Summary In the right atrium of the heart of the golden hamster histology, enzyme histochemistry, and formaldehyde-induced fluorescence reveal conductive tissue, which does not belong to the SA or AV node. Morphology, metabolism, vascularisation, and innervation of this tissue are the same as in the other regions of the impulse conducting system. The functional significance of the additional nodal tissue is discussed.
    Type of Medium: Electronic Resource
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