CONTENTS xvii 



PAGE 



2. ANATOMY OP THE SPINAL NERVES : Number of Nerves 



Distribution of Nerves Origin of the Nerves Structure 

 of a Spinal Nerve Structure of a Spinal Ganglion Rela- 

 tion of Cells and Fibers 260 



3. PHYSIOLOGY OF THE SPINAL CORD AND THE SPINAL NERVES : 



Experiments on Animals Functions of Nerve Fibers 

 Nerve Impulses Reflex Action 263 



4. THE SYMPATHETIC NERVOUS SYSTEM: Anatomy Physiology 266 



5. THE NERVOUS SYSTEM OF A FROG : Reason for Studying a 



Frog's Brain Forebrain Midbrain Hindbrain The 

 Spinal and Sympathetic Nerve Systems Summary 

 Frog Physiology Functions of the Spinal Cord Func- 

 tions of the Hindbrain and Midbrain Effect of remov- 

 ing the Cerebral Hemispheres Function of the Cerebral 

 Hemispheres Summary 268 



6. ANATOMY OF THE HUMAN BRAIN : Protection for the Brain 



Parts of the Brain Hindbrain Forebrain Midbrain 



Comparison of Human and Frog Brains Section of 

 Forebrain Microscopic Structure of the Brain Sensory 

 and Motor Cells and Fibers The Cranial Nerves . . 273 



7. PHYSIOLOGY OF THE BRAIN: Reflex Activities Conscious 



Activities Localization of Functions in the Brain 

 Habitual Activities Importance of Habit . . . .278 



8. HYGIENE OF THE NERVOUS SYSTEM : Changes in the Nervous 



System during Life Necessary Conditions for a Healthful 

 Kervous System Food and Air Varied Activity Rest 



Effect of Alcohol on the Nervous System . . .283 



9. A COMPARATIVE STUDY OF THE NERVOUS SYSTEM : Nerve 



Functions in Amoaba The Nervous System of the Earth- 

 worm Nervous Functions in the Earthworm The Nerv- 

 ous System of Invertebrates and of Vertebrates A 

 Comparison of Vertebrate Brains 287 



CHAPTER XIV 

 A STUDY OF THE SENSES 



1. THE SENSE OF TOUCH: The Sense Organs of Touch Sen- 



sations of Touch 291 



2. GENERAL SENSES: Sensations of Temperature Sensations 



of Pain Sensations of Hunger and Thirst . . . 293 



