1433 



diameter, 930 



peripheral origin, 931 

 antagonists, facilitation, 942 

 blood flow 



motor stimulation and, 806 



vasodilators and, 1155 

 efferent libers 



alpha and gamma, 933 



diameter, 933 



function and diameter, 934 

 eye muscles, 1090- 1094 

 fiber type, relation to motoneuron, 1072 

 flower-spray endings, function, 1082 

 intrafusal fibers, 1068 

 length 



in rigidity and spasticity, 887 



reflex control, 910 

 phasic contractions, definition, 1266 

 plcisticity, description, 1067 

 representation in motor cortex, 805 

 smooth 



denervation and, 993 



myogenic automaticity, 993 

 striate, tone, cerebellum and, 1264 

 synergists, disynaptic inhibition of, 942 

 tension, reflex control, 910 

 voluntary contraction, unit activity, 



1073 

 Muscle spindles 



activity, gamma motoneurons and, gio 

 description, 1068 

 gamma innervation, 886 

 identification of endings, 1068 

 in eye muscles, 1090 

 motor innervation and posture, 1076 

 role in posture, 1069 

 structure, 931 

 Muscle tone 

 definition, 1266 

 plastic 



reflex character, 887 



surgical treatment, 887 

 striate muscle, cerebellum and, 1264 

 suppressor areas and, 1352 

 Myoclonic syndrome 



description, 867 

 Myosensory tension 



definition, 1 1 07 

 Myotatic reflexes 

 definition, 1068 

 enhancement in rigidity, 887 

 in spinal animal, 784 

 inverse, description, 941 

 micturition and, 12 15, 12 19 

 monosynaptic response, 785 

 nucleus niger and, 888 

 self-energizing eff^ect, 785 

 Myotatic unit 

 definition, 941 



Nerve fibers 



see also Afferent fibers 

 groups A, B and C, 984 



caliber spectra, 984 



heterogenous regeneration, 996 



myelinated, distribution, 983 



regeneration, 995, 996 

 species differences, 995 

 Nerve impulse 



frequency, 1134, 1 137 

 Neurocrinie 



definition, 1039 

 Neurohormones 



see also Neurosecretion 



activation of anterior pituitary, 1012 



transfer of stimuli by, 1012 

 Neurohypophysis: see Posterior pituitary 

 Neuromuscular transmission 



in blood vessels, 11 33-1 137 



skeletal muscles, 1 1 36 

 Neurons 



as neurosecretory cells, 1040 

 Neurosecretion, 1039- 1060 



ACTH release, 1054, 1055 



centrifugation of granules, 1 043 



electromicroscopy of granules, 1 043 



into ventricular fluid, 1046 



invertebrates, 1057- 1060 



lumbricus, 1057 



peripheral nervous system, 1 056 



staining methods for, 1043 



systems, not staining with chrom- 

 hematoxylin, 1056 



vertebrates, 1040- 1057 

 Neurosecretory fibers 



definition, 1040 



electrical activity of, 1053 



termination in various parts of brain, 

 1046 

 Neurosecretory granules 



centrifugation, 1043 



differentiation from mitochondria, 



1045 

 electromicroscopy, 1 043 

 from various species, 1044 

 staining methods for, 1043 

 Neurosecretory material 

 axon transport, 1053 

 control of anterior pituitary and, 1055 

 correlation 



with antidiuretic hormone, 1048 



with posterior lobe hormones, 1050 

 effects of depletion, 1 048 

 experimental reduction of, 1048 

 hibernation, 1046 

 histochemistry, 1047 

 ontogeny, 1047 



staining for sulfhydryl groups, 1047 

 supraopticohypophyseal tract and, 1050 

 transfer, 1046 

 Norepinephrine 



see also Epinephrine, Catechol amines 



as transmitter substance, 1000 



as transmitter substance in coronary 



vessels, 1 133, 1 137 



at postganglionic adrenergic nerve 

 terminals, 1 1 33 



in skeletal muscle vessels, 1 1 33 

 Nucleus interstitialis 



rotation and, 891, 893 

 Nucleus lateropolaris ; see Thalamic 



nuclei 

 Nucleus niger 



ablation of, 884 



epinephrine in, 888 



function, 888, 920 



lesions in, 868 

 man, 886 



Parkinsonism and, 885 



stimulation of, 884 

 Nucleus reticularis: see Thalamic nuclei 

 Nucleus ruber 



ablation, 88g 



as efferent path for extrapyramidal 

 motor system, 872 



destruction in man, 890 



function, 920 



hypokinesia and, 787 



in various species, 888 



stimulation, 888 

 Nucleus subthalamicus 



contraversive syndrome and, 879 



destruction in man, 879 



function of, 880 



lesions in, 867 



stimulation of, 878 

 Nucleus, ventrocaudalis : see Thalamic 



nuclei 

 Nucleus ventrointermedium : see Thal- 

 amic nuclei 

 Nucleus vcntro-oralis: see Thalamic 



nuclei 

 Nystagmus 



cerebellar, i t 06 



definition, 1098 



optokinetic, 1099, 11 01, 1102 



production of, 1098 



reticular formation and, 913 



Obesity 



hypothalamus and, 969 

 Occipital cortex: see Visual cortex 

 Oculomotor nerve 



autonomic functions of, 962 



eye movements and, 1094, 1095 

 Olfaction 



cortical areas for, 1 367 



hippocampus and, 1381 

 Olfactory brain 



critique of term, 1 367 

 Olfactory cortex 



inhibition and, 1356 

 Optokinetic nystagmus: see Nystagmus, 



optokinetic 

 Optovestibular regulation 



posture, 901 

 Orbital cortex 



gastric motility, 1359 



