TAiLE OF CONTENTS. 



BOOK VI. 

 APPARATUS OF USTNERVATIOM". 



FIRST SECTION— THE NERVOUS SYSTEM IN GENERAL . . 738 



General Conformation of the Nervous System .... 738 



Structure of the Nervous System ...,., 739 



Properties and Functions of the Nervous Systems .... 74S 



SECOND SECTION.— THE CENTRAL AXIS OF THE NERVOUS SYSTEM 747 



Chapter I.— Protective and Enveloping Parts of the Cerebro-spinal Axis 747 



The Bony Case containing tlie Central Cerebro-spinal Axis . . 747 



1. The Spinal Canal ....... 747 



2. The Cranial Cavity ....... 747 



The Envelopes of the Cerebro-spinal Axis ..... 748 



1. The Dura Mater ....... 749 



2. The Arachnoid ........ 751 



3. The Pia Mater ....... 753 



Differential Characters in the Protecting and Enveloping Parts of the Cerebro- 

 spinal Axis in the other Animals ...... 7.54 



Comparison of the Protective and Enveloping Parts of the Cerebro-spinal Axis 



of Man with those of Animals ...... 754 



Chapter II.— The Spinal Cord ....... 754 



External Conformation of the Spinal Cord . . . . 754 



Internal Conformation and Structiure of the Spinal Cord . . . 757 



Differential Characters in the Spinal Cord of the other Animals . . 763 



Comparison of the Spinal Cord of Man with that of Animals . . . 763 



Chapter III.— The Brain, or Encephalon ..... 763 



Article I. — The Brain as a Whole ...... 763 



Article II. — The Isthmus ....... 766 



External Conformation of the Isthmus ..... 766 



1. Tlie Medulla Oblongata ...... 767 



2. The Pons Varolii ....... 769 



3. The Crura Cerebri ....... 770 



4. The Crura Cerebelli . . . . . . . 77 1 



5. Tlie Valve of Vieussens ...... 771 



6. The Corpora Quadrigemina, or Bigemina . . . .771 



7. The Optic Thalami ....... 772 



8. Tiie Pineal Gland ....... 772 



9. The Pituitary Gland ...... 773 



Internal Conformation of the Isthmus ...... 774 



1. The tiiird or Middle Ventricle, or Ventricle of the Thalami Optici . 774 



2. The Aqueduct of Sylvius ...... 775 



3. The Posterior, or Cerebellar Ventricle .... 776 



Structure of the Isthmus ....... 776 



Differential Characters in the Isthmus of the other Animals . . 778 



Comparison of the Isthmus of Man with that of Animals . . . 778 



Article III. — The Cerebellum ...... 778 



1 . External Conformation of the Cerebellum ..... 779 



2. Internal Conformation of the Cerebellum .... 781 

 Differential Cliaraeters of the Cerebellum in the other Animals . . 782 



Comparison of the Cerebellum of Man with that of Animals . • 782 



Article IV.— The Cerebrum ....... 783 



External Conformation of the Cerebrum ..... 783 



1. The Longitudinal Fissure ...*•• 783 



2. The Cerebral Hemispheres ...... 784 



Internal Conformation of the Brain ...... 789 



1. The Corpus Callosnm ...... 789 



2. The Lateral or Cerebral Ventriclee . . . • ,790 



3. The Septum Lucidum . . . • * • 791 



4. The Trigonum, or Fornix .... ,791 



5. The Hippocampi .... • • , 791 



