Pflügers Archiv

, Volume 323, Issue 2, pp 173–181 | Cite as

The electrocardiogram (ECG) and impulse conducting system (ICS) of the Asian musk shrew,Suncus murinus

  • G. L. Dryden
  • R. Gossrau
  • H. E. Dale
Article

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.

Key-Words

Shrew Heart Electrocardiogram Impulse Conducting Tissue 

Schlüsselwörter

Spitzmaus Herz Elektrokardiogramm Reizleitungssystem 

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References

  1. Bauereisen, E.: Normale Physiologie des Herzens. In: Das Herz des Menschen (W. Bargmann, W. Doerr, Hrsg.), Bd. I, S. 313–354. Stuttgart: Thieme 1963.Google Scholar
  2. Davies, F.: The conducting system of the bird's heart. J. Anat. (Lond.)64, 129–146 (1930a).Google Scholar
  3. —: Further studies of the conducting system of the bird's heart. J. Anat. (Lond.)64, 317–323 (1930b).Google Scholar
  4. —, Francis, E. T. B.: The conducting system of the vertebrate heart. Biol. Rev.21, 173–188 (1946).Google Scholar
  5. DiDio, L. A. J.: Myocardial ultrastructure and electrocardiograms of the hummingbird under normal and experimental conditions. Anat. Rec.159, 335–352 (1967).Google Scholar
  6. Doerr, W.: Normale und pathologische Anatomie des reizbildenden und erregungsleitenden Gewebes. Verh. dtsch. Ges. Kreisl.-Forsch.35, 1–36 (1969).Google Scholar
  7. Dryden, G. L.: Growth and development ofSuncus murinus in captivity on Guam. J. Mamm.49, 51–62 (1968).Google Scholar
  8. Gossrau, R.: Über das Reizleitungssystem der Vögel. Histochemische und elektronenmikroskopische Untersuchungen. Histochemie13, 111–159 (1968).Google Scholar
  9. —: Topographische und histologische Untersuchungen am Reizleitungssystem von Vögeln. Z. Anat. Entwickl.-Gesch.128, 163–184 (1969).Google Scholar
  10. Gossrau, R., Dryden, G.: in preparation.Google Scholar
  11. Guyton, A. C.: Textbook of medical physiology. Philadelphia: Saunders Co. 1966.Google Scholar
  12. James, T. N.: The conducting pathway between the sinus node and the AV node and between the right and left atrium in the human heart. Amer. Heart J.66, 498–508 (1963).Google Scholar
  13. Mathur, P. N., Bhargava, S. C.: The heart ofSuncus murinus. Proc. Indian. Acad. Sci., Sect. B60, 264–272 (1964).Google Scholar
  14. Mullen, R. K.: Comparative electrocardiography of the squamata. Physiol. Zool.40, 114–126 (1967).Google Scholar
  15. Patt, D. I., Patt, G. R.: Comparative vertebrate physiology. New York: Harper and Row, Inc. 1969.Google Scholar
  16. Robb, J. S., Petri, R.: Expansions of the atrioventricular system in the atria. In: The specialized tissues of the heart (A. P. de Carvalho, W. C. DeMello, B. F. Hoffman, eds.). Amsterdam: Elsevier 1961.Google Scholar
  17. Romeis, B.: Mikroskopische Technik. München: Oldenbourg 1948.Google Scholar
  18. Romer, A. S.: The vertebrate body. Philadelphia: W. B. Saunders Co. 1962.Google Scholar
  19. Ruch, T. C., Patton, H. D. (eds.): Physiology and biophysics. Philadelphia: Saunders 1965.Google Scholar
  20. Schiebler, T. H.: Herzstudie. II. Mitt. Histologische, histochemische und experimentelle Untersuchungen am Atrioventricularsystem von Huf-und Nagetieren. Z. Zellforsch.43, 243–306 (1955).Google Scholar
  21. — Doerr, W.: Orthologie des Reizleitungssystems. In: Das Herz des Menschen (W. Bargmann, W. Doerr, Hrsg.), Bd. I, S. 165–227. Stuttgart: Thieme 1963.Google Scholar
  22. Sturkie, P. D.: Avian physiology. New York: Ithaca 1965.Google Scholar
  23. Truex, R. C.: Comparative anatomy and functional considerations of the cardiac conduction system. In: The specialized tissues of the heart (A. P. de Carvalho, W. C. DeMello, B. F. Hoffman, eds.) Amsterdam: Elsevier Publishing Co. 1961.Google Scholar
  24. — Smythe, M. Q.: Recent observations on the human cardiac conduction system with special considerations of the atrioventricular node and bundle. In: Electrophysiology of the heart (B. Taccardi, G. Marchetti, eds.). London-New York: Pergamon Press 1965.Google Scholar

Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • G. L. Dryden
    • 1
    • 2
  • R. Gossrau
    • 3
  • H. E. Dale
    • 4
  1. 1.Department of Biology, Slippery Rock State College
  2. 2.Caribbean Primate Research CenterSan Juan
  3. 3.Department of AnatomyUniversity of WürzburgWürzburgGermany
  4. 4.Department of Veterinary Physiology and PharmacologyUniversity of MissouriColumbia

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