INDEX. 



Nerve, optic, 194 



recurrent sensibility of anterior 



roots, 77 



spinal accessory, nucleus of, 230 

 third cranial, nucleus of, 226 

 trigeminal, nucleus of, 227 

 twelfth cranial, nucleus of, 230 

 vagus, nucleus of, 229 

 Nerve-cell, chromato lysis of, 121 

 classification of, in spinal cord, 



154 



degenerative changes in, 120 

 general physiology of, 128 

 internal structure of, 126 

 metabolism in, 129 

 neuron doctrine, 122 

 reaction of, 129 

 refractory period of, 132 

 summation of stimuli in, 130 

 varieties of, 124 



Nerve-fibers, action current of, 96 

 afferent and efferent, 75 

 anodal and cathodal stimula- 

 tion of, 82 



antidromic impulses in, 78 

 artificial stimuli of, 80 

 classification of, 75 

 core model of, 10 

 degeneration and regeneration 



of, 118 



demarcation current of, 91 

 direction of conduction, 107 

 du Bois-Reymond's law of stim- 

 ulation, 82 

 electrical stimulation of, in man, 



89 



electrotonic currents of, 101 

 electrotonus of, 83 

 impulse in, historical, 104 

 independent irritability of, 80 

 metabolism in, during activity, 



112 



myelin sheath of, 73 

 nutritive relations to nerve 



cells, 116 

 opening and closing tetanus 



of, 86 

 Pfliiger's law of stimulation of, 



84 



stimulation of, in man, 86 

 structure of, 73 



unipolar method of stimulating, 



87 



Nerve-impulse, historical, 104 

 metabolism during, 111 

 modification of, by various in- 

 fluences, 109 



qualitative changes in, 76, 115 

 relation of, to action current, 



100, 107 

 theories of, 113 

 velocity of, 105 



Nervi erigentes, 236, 545 

 Neurogenic theory of heart beat, 497 

 Neuron doctrine, 122 

 Neurons, varieties of, 124 

 Nicotin, action of, on salivary secre- 

 tion, 676 



on sweat secretion, 768 

 use of, in tracing autonomic fibers, 



233 



Night-blindness, hemeralopia, 331 

 Ninth cranial nerve, nucleus of, 229 

 Nissl's granules, 127 

 Nitric oxid hemoglobin, 392 

 Nitrogen, condition of, in blood, 602 

 determination of, 784 

 equilibrium, 783 



effect of non-proteid food on, 



786 



excretion in urine, 752 

 Nitrogenous extractives of muscle, 61 

 Nodal point of eye, 286 

 Non-polarizable electrodes, 95 

 Normoblasts, 402 

 Nucleo-albumin, general properties 



of, 878 

 in bile, 727 

 Nucleon, 60 

 Nucleoproteids, 880 

 in blood, 414 



OBESITY, physiological cause of, 799 

 Ohm's law of composition of sound 



waves, 365 

 Olf action, end-organ for, 275 



mechanism of, 276 

 Olfactometer, 280 

 Olfactory associations, 281 



bulb, histological structure of, 202 



center in cortex, 202 



nerve, course of fibers of, in brain, 



203 



organs, fatigue of, 279 

 sensations, classification of, 278 

 conflict of, 281 

 qualities of, 277 

 threshold stimulus, 280 

 sense cells, 276 

 stimuli, nature of, 277 

 Oncometer, 749 

 Ophthalmoscope, 305 

 Opotherapy, 771 

 Optic chiasma, decussation in, 195 



structure of, 194 

 nerve, course of fibers of, in brain, 



193 



radiation, 193 

 thalamus, functions of, 214 



in vision, 197 

 tracts, structure of, 195 

 Optical deceptions, 350 

 Optograms on retina, 311 



