CONTENTS OF PART III. 

 BOOK III. 



THE CENTKAL NEEVOUS SYSTEM AND ITS INSTEUMENTS. 



CHAPTER I. 

 THE SPINAL CORD. 



SECTION I. 



ON SOME FEATURES OF THE SPINAL NERVES. 



PAGE 



558. The spinal nerves 849 



559. On efferent and afferent impulses 



560. Efferent fibres run in the anterior root and afferent fibres in the 



posterior root ^52 



561. The "trophic" influence of the ganglion of the posterior root; the 



degeneration of nerve fibres 853 



SECTION II. 



THE STRUCTURE OF THE SPINAL CORD. 



562. The general features of the cord; grey and white matter . . 856 



The structure of the white matter ; neuroglia 859 



564. The structure of the grey matter 861 



565. The central canal, the substantia gelatinosa centralis, and the 



substantia gelatinosa of Eolando . 863 



566. The grouping of the nerve cells. The cells of the anterior and 



posterior horn, the lateral group, Clarke's column, and the lateral 



horn. The reticular formation 865 



567. The tracts of white matter. Median posterior column, external 



posterior column. The evidence of the differentiation of the white 

 matter into tracts. Ascending and descending degeneration. 

 Descending tracts : crossed and direct pyramidal tracts, antero- 

 lateral descending tract. Ascending tracts: cerebellar tract, 

 antero-lateral ascending tract, median posterior tract . . . 869 



