690 



NERVOUS SYSTEM. 



The proportionate weight of the cerebellum to that of the cerebrum, in the male, is 

 as 1 to 8f, and in the female, as 1 to 8J. (Quain.) 



The specific gravity of the whole encephalon is about 1036, that of the gray matter 

 being 1034, and of the white, 1040. (Quain.) 



Some Points in the Physiological Anatomy of the Encephalon and its Connections. 

 The direction of the fibres in the encephalon, their connections with the cells of the 

 gray substance, the course of commissural fibres connecting together the different parts 

 of the gray substance of the cerebrum, the cerebellum, and the deeper ganglia, and 

 finally the avenues of communication between the fibres of the encephalon and the cord, 

 are points of exceeding intricacy ; and many of them are still so uncertain and obscure, 



FIG. 226. Diagrammatic representation of the direction of the fibres in the cerebrum. (Le Bon.) 



that they cannot as yet be connected satisfactorily with the exact results of physiological 

 inquiry. All that we can do at present, is to recognize certain ganglionic masses, the 

 separate functions of which have been more or less accurately defined, and to show, as 

 far as possible, their anatomical relations to each other and to the spinal cord. Perhaps 

 the most elaborate and, to a certain extent, the most satisfactory observations upon the 

 various points to be considered, are those of Luys; but this author describes the course 



