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. 1987 Dec;19(12):1221-36.
doi: 10.1016/s0022-2828(87)80532-1.

Functional morphology of the pig sinoatrial node

T Opthof  1 , B de Jonge, H J Jongsma, L N Bouman
Affiliations

Functional morphology of the pig sinoatrial node

T Opthof et al. J Mol Cell Cardiol. 1987 Dec.

Abstract

The porcine sinoatrial node in an isolated right atrium preparation is characterized by unifocal impulse generation. It has a rather elongated shape and the larger part of its volume is taken up by collagen and fibroblasts. The impulse appears to emerge from a site where the percentage of myofilaments is relatively low. The impulse is propagated faster towards the crista terminalis than to the interatrial septum with preference for the oblique-upward direction. A very large zone of cells with low excitability is located at the interatrial septal side of the node.

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