PREFACE 



IN the pages which follow the anatomy of the nervous system has been pre- 

 sented from the dynamic rather than the static point of view; that is to say, 

 emphasis has been laid on the developmental and functional significance of struc- 

 ture. The student is led at the very beginning of his neurologic studies to think 

 of the nervous system in its relation to the rest of the living organism. Struc- 

 tural details, which when considered by themselves are dull and tiresome, become 

 interesting when their functional significance is made obvious. This method of 

 presentation makes more easy the correlation of the various neurologic courses 

 in the medical curriculum. For physiologic and clinical neurology a knowledge 

 of conduction pathways and functional localization is essential, and this informa- 

 tion can best be acquired in connection with the course in anatomic neurology. 

 In selecting the material to be included in this book the needs of the medical 

 student have been kept constantly in mind, and emphasis has been placed on 

 those phases of the subject which the student is most likely to find of value to 

 him in his subsequent work. 



In many laboratories the head of the shark and the brain of the sheep have 

 been used to supplement human material. The book has been so arranged as to 

 facilitate such comparative studies without making it any the less well adapted 

 to courses where only human material is used. 



During the past twenty years very considerable additions have been made to 

 the science of neurology, and the more important of these have been included in 

 the text. While a detailed presentation of the evidence concerning new or dis- 

 puted points would be out of place in a book of this kind, whenever the state- 

 ments made here differ from those found in other texts the authority has always 

 been cited, the author's name and the date of his contribution being given in 

 parentheses. A full list of these references to the literature has been included in 

 a Bibliography at the end of the volume. 



The terminology adopted is that of the B. N. A., which has been used, for 

 the most part, in its English form. But in the case of the fiber tracts the Basle 



