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Am J Physiol Heart Circ Physiol 257: H1446-H1457, 1989;
0363-6135/89 $5.00
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AJP - Heart and Circulatory Physiology, Vol 257, Issue 5 1446-H1457, Copyright © 1989 by American Physiological Society

ARTICLES

Structure of canine Bachmann's bundle related to propagation of excitation

P. C. Dolber and M. S. Spach
Department of Pediatrics, Duke University Medical Center, Durham, North Carolina 27710.

Impulse propagation and histology were studied in adult and neonatal canine Bachmann's bundle. Both showed nonuniform electrical anisotropy: effective longitudinal conduction velocity (theta L) markedly exceeded effective transverse conduction velocity (theta T), and extracellular potential waveforms with transverse propagation were polyphasic. An age difference in theta L (0.80 m/s neonate, 1.31 m/s adult) was found; it could be largely accounted for by a difference in myocyte diameter (4.7 microns neonate, 17.1 microns adult). Close apposition of myocytes in the neonate and development of transverse tubules in the adult may have influenced theta L at each stage. Perimysial septa separated fascicles in both neonatal and adult bundles; however, endomysial septa between individual myocytes were completely developed only in adult bundles. Thus perimysial septa were much more responsible for nonuniform anisotropy and low theta T than endomysial septa. Fascicle diameter and length were greater in the adult, which may have affected transverse propagation. Specialized conduction system cells could not be identified.


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