Therapeutics of the circulation / by Sir Lauder Brunton.

Lauder Brunton

Date:: 1914

Credit: Therapeutics of the circulation / by Sir Lauder Brunton. Source: Wellcome Collection.

53/568 page 25

$PHYSIOLOGY OF THE HEART Movements of the Heart—Heart of the Frog—Origin of the Cardiac Rhythm—Neurogenic and Myogenic Theories—Block Fibres—Differentiation of Proto¬ plasm—Difference between Neurogenic and Myo¬ genic Theories—Origin of Stimuli in the Frog’s Heart —Conduction of Stimuli in the Heart—Heart-block— Gaskell’s Experiments—Are the Cardiac Nerves useless?—Comparison between the Heart and a Medusa — Experiments of Romanes—Blocking of Stimuli in a Medusa—Interference of Waves — Inhibition—Inhibition in Medusa and in the Turtle’s Heart—Inhibition in the Frog’s Heart — Action of Vagus—Inhibitory Ganglia—Stannius’s Experiments —Refractory Period of the Heart—Experiments of Brunton and Cash—Refractory Period of the Ven¬ tricle-Refractory Period of the Auricle—Stimula¬ tion of the Venous Sinus — Extra Systoles — Compensatory Pause—Conduction of Stimuli in the Heart, by Nerves as well as by Muscle—Practical bearing of these Experiments. Movements of the Heart.— In the frog’s heart the venous sinus contracts first and drives the blood into the auricles. In the mammalian heart the venous sinus is absent; and therefore in con¬ sidering the movements of the heart we begin with the auricle, which contracts and drives the blood into the empty ventricle. The ventricle$

Therapeutics of the circulation / by Sir Lauder Brunton.

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