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January 16, 1909, Vol LII, No. 3 >
ARTICLE | January 16, 1909

THE BEGINNING OF THE CONTRACTION OF THE VENTRICLE OF THE HEART

JAMA. 1909;LII(3):218. doi:10.1001/jama.1909.02540290044009.
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There has long been dispute as to whether the ventricle of the heart begins to contract at its base or at its apex. The proximity of the base of the heart to the auricle or atrium lends color to the view that the basal portion of the ventricle contracts first. The recent studies of Tawara, Retzger and others on the distribution of the stimulus-conducting system continuous with the bundle of His have shown that the fibers pass downward into each ventricle to the region of the papillary muscles, where they break up into arborizations and are distributed thence partly toward the base of the heart, partly toward its apex. This anatomic distribution suggested that the base of the papillary muscles and the lowermost portions of the wall of the ventricle must receive the stimulus to contraction before the muscle fibers at the base of the heart. This probability has been

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