CONTENTS. XI 



CHAPTER II. 



NERVOUS IRRITABILITY, AND ITS MODE OF ACTION. 



PAGE 



Nature of nervous irritability Irritability of sensitive fibres Irritability of 

 motor fibres Identity of action in sensitive and motor nerve fibres Ra- 

 pidity of transmission of the nerve force Methods of determining its rate 

 of transmission Rate of transmission in the motor nerves In the sensitive 

 nerves In the spinal cord Rapidity of nervous action in the brain Va- 

 riation of nervous rapidity in different individuals .... 417-431 



CHAPTER III. 



GENERAL ARRANGEMENT OF THE VARIOUS PARTS OF THE NERVOUS 



SYSTEM. 



Two divisions of the nervous system Ganglionic system Cerebro-spinal 

 system Spinal cord Brain Brain of fish Of reptiles Of birds Of 

 quadrupeds Of man Medulla oblongata Olivary bodies Tuber annu- 

 lare Crura cerebri Cerebral ganglia Connection of the different parts 

 of the cerebro-spinal system 432-442 



CHAPTER IV. 



THE SPINAL CORD. 



General structure of the spinal cord Arrangement of its gray and white sub- 

 stanceGray substance of the cord White substance of the cord Con- 

 nection of the spinal nerve roots with the spinal cord Transmission of 

 motor and sensitive impulses in the spinal nerves and nerve roots In the 

 spinal cord Sensitive and excitable parts of the spinal cord Channels 

 for sensation and motion in the spinal cord Crossed action of the spinal 

 cord Decussation of the motor tracts Decussation of the sensitive tracts 

 Various forms of paralysis from lesions of the cerebro-spinal axis Para- 

 plegia Hemiplegia Reflex action of the spinal cord . . . 443-470 



CHAPTER V. 



THE BRAIN. 



General structure of the brain The hemispheres Cerebral convolutions 

 Physiological properties of the hemispheres Intellectual faculties Special 

 seat of articulate and written language Special centres of motion in the 

 hemispheres The cerebral ganglia The cerebellum Physiological pro- 

 perties of the cerebellum The tuber annulare Physiological properties of 

 the tuber annulare Medulla oblongata Physiological properties of the 

 medulla Its action as a nervous centre Its influence on respiration On 

 deglutition On phonation On articulation ..... 471-510 



CHAPTER VI. 



THE CRANIAL NERVES. 



Classification of the cranial nerves Olfactory nerves Optic Oculomo- 

 torius Patheticus Trigeminus Abducens Facial Auditory Glosso- 

 pharyngeal Pneumogastric Spinal accessory Hypoglossal General 

 arrangement and mode of origin of the cranial nerves . . . 511-581 



