INDEX. 



1041 



Nerve-cell, maturing of the, 611 



nutrition of the, influences acting on the, 



626-639 



physiology of the, 607-639 

 single, nerve-impulse within a, 618 

 spinal-cord, volume of, 611 

 stimuli necessary to elicit a response in a, 



number of, 625 

 trophic influences on the, 627 

 Nerve-cells, changes in, due to age, 617 

 classes of, defined, 641 

 cytoplasm of, changes in the, 617 

 disuse of, effect of, upon reflex action of 



nerve-fibres, 666 



efferent, sympathetic relations of the, 654 

 forms of, 607 



groups of, in central nervous system, 639 

 growth of, 610 



impulses of, rate of discharge of, 623 

 in central nervous system, number of, 731 

 increase in the mass of, 731 



in the number of, in central nervous sys- 

 tem, 727, 728 

 location of, 36 

 medullation of, 614 

 metabolism in, in old age, 742 

 peculiarities of, 608 

 size and function of, 610 



in different animals, 609 

 types of, 612, 613 

 unipolar, 441 

 vaso-motor, 488, 489 

 Nerve-elements, classification of, 641 



degeneration and regeneration of, 633 

 enlargement in the, average, 731 

 functional, increase in the number of, in 



central system, 727 



Nerve-fibre, axis-cylinder, conductivity of, 82 

 branches, growth of, 613 

 chemical reaction of, 151 

 composition of, 150, 151 

 defined, 607 



degeneration and regeneration of, 52, 82 

 injured, absorption-process following, 82, 83 



recovery, functional, 83 

 irritability and conductivity of, 624 

 Nerve-fibres, afferent or centripetal, 36 



of spinal cord, 645 

 arrangement of, 36 

 association, cortical, 697 

 auditory, of the cochlea, 821 



terminations of, 815-818 

 cardiac inhibitory, origin of, 468 

 cerebral, of the salivary glands, 159, 160 



varieties of, 729 

 cholesterin of, 264 

 classes of, 36 



medullated, 36 

 non-medullated, 36 

 constrictor, of the pupils, 769, 770 

 cortical, increase in the, 729 

 decussation of, 647, 680, 681, 768 

 degeneration of, after hemisection of cord, 

 669 



in the central system, 634 



of non-medullated, 633 



of nucleated portion of, 635 



secondary, of cortical, 687 

 dependence of, on the blood-supply, 74 

 diameters of the neurons of, 613 

 dilator, of the pupils, 769, 770 

 dorsal root, number of, 673 

 efferent or centrifugal, 36 

 extrinsic, intestinal, 322, 323 



of the stomach muscles, 316, 319, 320 

 function of, 36 

 " germinal," 688 



66 



Nerve-fibres, glyco-secretory, 188 



growth of the medullary sheath of, 615 



lecithin of, 265 



medullation of, 614, 615, 729 



motor, of the gall-bladder, 188 



of liver-cells, existence of, 185 



of salivary glands, 159 



of sweat-glands, 199 



of the bladder, 330 



of the eye-muscles, 746 



of the parotid, 159 



of the skin, 281, 835 



of the sphincter ani, 324 



of the spleen, 272, 273 



of the stomach, 316 



olfactory, 850 



optic, insensibility of, to light, 774 



number of, 770 

 pressor and depressor, 494 

 regeneration of, 58, 82, 636 

 relation of medullary sheath and axis-cyl- 

 inder of, to the central system, 616 

 to the peripheral nervous system, 615 

 secretory, action of, upon the formation of 



bile, 188 

 connection between the gland-cells and 



the, 161 



in the pancreas, proof of, 173, 174 

 normal function of the, in the sympa- 

 thetic, 171 

 of the kidney, 191 

 termination of, 161 

 theory of, 165, 166 

 varieties of, 155 

 sensory, ending of, in the skin, 835 



of the tongue, 852 

 stimulation and changes in temperature on, 



effect of, 614, 615 

 structure of, 36 

 trophic, theory of, 165, 166 

 thermogenic, 598 

 vaso-constrictor of the kidneys, action of, 



196, 197 

 vaso-dilator of the kidneys, action of, 196, 



197 



vaso-motor of the lungs, 574 

 Nerve-impulse, afferent, of the cortex composite 



character of, 700 

 defined, 40, 611 

 direction of the, 619 

 extension of the, conditions surrounding 



the, 619 



pathways of the, double, 621 

 points in the cell-body at which the, can be 



aroused, 624 

 rate of, 618, 738, 739 



theories of the passage of the, in the cen- 

 tral system, 644 

 within a single nerve-cell, 618 

 Nerve-impulses, arrangement of, in the central 



system, 621 



course of the, on leaving the cortex, 695 

 effect of, on the cell-body, 622 

 efferent, reaction of, 660 

 olfactory, pathway of, 682 

 pathways of the, 618, 647-657, 668, 682 

 sensory, pathways of, 668 

 Nerve-injury, electrical current of, 139 

 Nerve-muscle preparation, 49 

 Nerve-roots, afferent, 644, 645 

 Nerve-supply of the larynx, 868 

 Nerve-theory of heart-beat, 441 

 Nerve-tissues, specific gravity of, 732 

 Nerve-tracts in the central system, 668 

 Nerve-trunks, direct irritation of, excites no 

 sensations of temperature and touch, 

 841,842 



