CONTENTS 



of the cardiac excitation from auricle to ventricle; 

 Gaskell's block Ton us Influence of "load" on ven- 

 tricular contraction Influence of temperature on fre- 

 quency of contraction Action of inorganic salts on 

 heart muscle. 

 THE HEART SOUNDS 541 



THE PRESSURE-PULSE . * . 543 



Frequency Hardness Form Volume Pressure- 

 pulse in the artificial scheme Human pressure-pulse 

 cur ve Low tension pressure-pulse Pressure-pulse 

 in aortic regurgitation Stenosis of the aortic valve 

 Incompetence of the mitral valve. 



THE VOLUME PULSE 552 



XIII 

 THE INNERVATION OF THE HEART AND BLOOD-VESSELS 



THE INNERVATION OF THE HEART AND BLOOD-VESSELS 554 



THE AUGMENTOR NERVES OF THE HEART 555 



Preparation of the sympathetic Action of sympathetic 

 on heart. 



THE INHIBITORY NERVES OF THE HEART .... . . 558 



Preparation of the vagus nerve Stimulation of car.6$ac 

 inhibitory fibres in vagus trunk Effect of vagus 

 stimulation on the auriculo-ventricular contraction in- 

 terval Irritability of the inhibited heart Intracar- 

 diac inhibitory mechanism Inhibition by Stannius 

 ligature Action of nicotine Atropine Muscarine 

 Antagonistic action of muscarine and atropine. 



THE CENTRES OF THE HEART NERVES 564 



Inhibitory centre Augmentor centre Reflex inhibition 

 of the heart ; Goltz's experiment Reflex augmentation. 



THE INNERVATION OF THE BLOOD-VESSELS .... 568 

 Bulbar centre Vasomotor functions of the spinal cord 

 Effect of destruction of the spinal cord on the distri- 

 bution of the blood Vasoraotor fibres leave the cord 

 in the anterior roots of spinal nerves Vasoconstrictor 

 fibres in the sciatic nerve Vasodilator nerves Reflex 

 vasomotor actions. 



