xiv CONTENTS 



NERVE (continued] PAGE 



Electrotonus - - 683 



Conduction in the nerve - 686 



Velocity of the nerve-impulse - 689 



Chemistry of nerve - 690 



Degeneration of nerve - - 691 



Regeneration of nerve - - 694 



Trophic nerves - - 699 



Classification of nerves - - 702 



CHAPTER XI. 



ELECTRO-PHYSIOLOGY - -717 



Currents of rest and action - 7 I 8 



Relation between action current and functional activity 725 



Polarization of muscle and nerve - 726 



Electrotonic currents - - 728 



Heart-currents - - 73 



Human electro-cardiogram - 73 T 



Glandular currents - 734 



Eye-currents - - 734 



Electric fishes - - 73& 



CHAPTER XII. 



THE CENTRAL NERVOUS SYSTEM 744 



Structure 744 



Development - 746 



Histology - 747 



Nutrition of the neuron - 756 

 General arrangement of grey and white matter in the 



central nervous system - 759 

 Arrangement of grey and white matter in the spinal cord 762 

 Arrangement of grey and white matter in the upper part 



of the cerebro-spinal axis 767 



Functions of the central nervous system - 786 



Functions of the spinal cord - - 788 



Decussation of the sensory paths 792 



Reflex action - - 796 



Influence of brain on spinal reflexes 806 



Automatism of the spinal cord - 812 



The cranial nerves - 815 



The functions of the brain - 827 



Functions of the cerebellum - 830 



Co-ordination of movements 837 



Functions of the cerebral cortex - 840 



' Motor ' areas - 844 



Sensory areas - - 858 



Aphasia - - 862 



