CHAPTEE II 



THE SPINAL COED AND THE FUNCTIONS OF THE CBEE- 

 BBLLUM 



The chief features of the spinal cord — The gray matter — Tracts 

 in the white matter — Fibres of the spinal nerve-roots — 

 Their functions and connections — Fibres of the posterior 

 root — The sensory and motor elements in the cord — The 

 fine fibres of the posterior roots — Other tracts — Functions 

 of cells in the anterior horn of gray matter — In the lateral 

 horn — In the posterior horn — Function of the pyramidal 

 tracts — An idiolateral pyramidal tract — Of the intermediate 

 bundle — Of the fundamental groups — Of the posterior 

 columns — Functional correspondence of elements in the 

 two horns — Size of nerve-cells and thickness of fibres as 

 a criterion of function — Increase of impulse-cells — The 

 nervous factors in the local augmentation of activity iu an 

 organism — Increase in the sensory stimulus is chiefly due 

 to internal causes — The physiological mechanism of will — 

 The part of the increase of impulse-cells in involuntary 

 action — The nature of desire — Points of resemblance be- 

 tween the cells of Purkinje and those of Clarke's column — 

 Opposite views respecting the functions of the cerebellum 

 — Pathological evidence — Ferrier's facts — Luoiani's cases — 

 Ferrier's views opposed to Luciani's— Cases of defective 

 development of the cerebellum — Co-orduiation is possible 

 in the absence of the cerebellum — Secondary centres of 

 the cerebellar system — The factors in equUibration — The 

 anatomical elements in equilibration — The cerebellum in 

 voluntary action — The relationship between parts of the 



