XX11 CONTENTS 



CHAPTER LXXXVIII 



PAGE 



THE PINEAL GLAND, THE GONADS, AND THE THYMUS 820 



Pineal Gland, 820; Goiiads or the Generative Organs, 821; Generative Glands 

 of the Male, 821 ; Generative Organs of the Female,. 822 ; Thymus, 824. 



PART IX 



THE CENTRAL NERVOUS SYSTEM AND THE CONTROL OF 

 MUSCULAR ACTIVITY 



(Rewritten by A. C. Redfield) 



CHAPTER LXXXIX 



THE EVOLUTION OF THE NEUROMUSCULAR MECHANISM 827 



Primitive Neuromuseular Mechanisms, 827 ; The Nerve Net, 830 ; The Cen- 

 tral Nervous System, 830. 



CHAPTER XC 



THE CONDITION OF THE NERVOUS IMPULSE 836 



Conduction in the Nerve Fiber, 837; The All or None Law, 837; Refractory 

 Period, 839 ; Conduction between Neurons, 841 ; Resistance Due to Synapse, 

 842 ; Summation, 842 ; Inhibition, 843 ; Canalization, 844 ; Myoneurarl Junc- 

 tion, 845. 



CHAPTER XCI 



THE NUTRITION OF NERVOUS TISSUE 846 



Function of the Nerve Cell Body, 846; Degeneration and Regeneration of 

 Nerve Fibers, 846; Metabolism of the Nerve Fiber, 850; Metabolism of the 

 Central Nervous System, 851. 



CHAPTER XCII 

 THE RECEPTORS 854 



The Evolution of Specialized Receptors, 854; Quality of Sensation and Its 

 Local Sign, 855; Referred Pain, 858; Cutaneous and Deep Sensibility, 859; 

 Touch, 860; Heat and Cold, 861; Pain, 862; Distribution of Sensitivity in 

 the Body, 863. 



CHAPTER XCIII 



THE AFFERENT PATHS OF SENSORY IMPULSES 866 



Segmental Distribution of Afferent Nerves, 866 ; Ascending Pathways in the 

 Spinal Cord, 868; Afferent Paths in the Brain Stem, 871; Afferent Impulses 

 Which Fail to Produce Sensation, 872. 



CHAPTER XCIV 



THE SENSORY CENTERS OF THE BRAIN 876 



The Sensory Center of the Optic Thalamus, 876; The Sensory Centers of the 

 Cerebral Cortex, 878; The Visual Areas, 880; Sensory Hallucinations, 883. 



