. Advanced lessons in practical physiology for students of medicine. Physiology. LESSON XIV THE HEART (Continued > INHIBITION AND ACCELERATION OF THE SIMPLE HEART. ACTION OF NICOTIN. ATROPIN, AND MUSCARIN 1. Inhibition of the Heart.—Apply a ligature tijilitly to the neck of an etherized turtle and destro}' the brain by pithing. Remove the ventral shield or plastron and clip away the projecting angles of the shoulder-blades. Arrange the inductorium for stimulation with a tetanic current of medium strength. Hold the extended neck of the turtle in place and carefully isolate the vagus nerve on
. Advanced lessons in practical physiology for students of medicine. Physiology. LESSON XIV THE HEART (Continued > INHIBITION AND ACCELERATION OF THE SIMPLE HEART. ACTION OF NICOTIN. ATROPIN, AND MUSCARIN 1. Inhibition of the Heart.—Apply a ligature tijilitly to the neck of an etherized turtle and destro}' the brain by pithing. Remove the ventral shield or plastron and clip away the projecting angles of the shoulder-blades. Arrange the inductorium for stimulation with a tetanic current of medium strength. Hold the extended neck of the turtle in place and carefully isolate the vagus nerve on each side. Place each in a loose ligature. Open the pericardial sac and connect the apical band of connective tissue with the writing lever. Adjust the. Fig. 53.—CotRSE of Vagus Xerve in Frog. (Stirling.) SM, Suhmentalis; Li', lung; I',vagus; GP, glossopharyngeal; HS, hypoglossal; L, larj-ngeal; PH, SH, GH, OH, petro-, sterno-, goiiio-, aud omohyoid; HG, hypoglossus; H, heart; BR, brachial plexus. writing point of a chronograph underneath the writing point of the lever. Raise the left vagus nerve and place it upon the electrodes. Having recorded a number of normal heart-beats, stinuilate the afore- said nerve. If the heart is not inhil)ited, increase the strength of the current, but not excessively, becau.'^e an electrolysis might then result which would destroy conduction permanently. Make a number of these records, stimulating each time for a few seconds. During what period of the cardiac cycle is the heart arrested? 8n. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Burton-Opitz, Russell, b. 1875. Philadelphia, London, W. B. Saunders Company
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