INDEX 



771 



Ionic pump 



Na, K concentrations and, 60, 62 

 Iproniazide 



adrenergic transmitter and, 224 



removal of catechol amines and, 227 

 Ischemia 



pain and, 463, 474 



resistance of nerve fibers to, 395 



thermal receptors and, 442, 443, 453 

 Isopropyl isonicotinyl hydrazine ; s^f Ipro- 

 niazide 

 Isopropylnorepinephrine 



see also Catechol amines; Norepineph- 

 rine; Epinephrine; Dopamine; Adre- 

 nergic transmitter; Transmitter sub- 

 stance 



as adrenergic transmitter, 229 

 Itching 



see also Pain 



as related to pain, 498, 499 



intracisternal injection of drugs and, 



499 

 intraventricular injection of drugs and, 



499 



Joint receptors 



central projection, 413 



discharge patterns of, 411 



Ruffini type endings, 412 

 J oints 



innervation of, 411-415 



sensations from, 409-415 



Kinesthesis, 388-390, 395-415 



central neurons for, 414 



definition, 388 



description of, 409 



invertebrate receptors for, 376-379 



joint receptors and, 41 i 



muscle stretch receptors, 410 



postcentral fields and, 423 



sites of receptors, 410 

 Kinesthetic systems, 387-426 



central classification, 396 



central representation, 395 

 Krause end bulbs 



as cold receptors, 434 



Labyrinth: see Vestibular mechanism 

 Labyrinthectomy 



compensation, 562 



eff'ects of, 561 



species differences, 562 

 Latency 



explanation, 163 



factors determining, 166 

 Lateral lemniscus: see Central auditory 



function 

 Lens 



see also Aphakia 



accommodation and, 660, 664 



age and, 662 



as limit to accommodation, 664 



nature of capsule, 661 



substance 

 index, 656 

 Light 



spectral distribution, 707 



unit of energy, 665 

 Light intensity 



pigment migiation and, 640 

 Light, response to : see Behasior 

 Li\er disorders 



dark adaptation and, 690 

 Local response : see Subthreshold response 

 Longitudinal current 



of axoplasm, 103 



space and time patterns of, 1 04 

 Loudness 



transmission of, 583 

 LSD 25: see Lysergic acid diethylamide 

 Luminance 



definition, 665 

 Luster 



conditions for, 737 

 Lux 



definition, 665 

 Lyotropic series 



taste threshold, 5 1 7 

 Lysergic acid diethylamide 



alpha activity and, 289 



Maculae: see Otolith organs 

 Magnesium 



end-plate potential and, 208 



p.s.p. and, 167 

 Malononitrile 



steady potential and, 318 

 Marsilid : see Iproniazide 

 Maxwell's spot 



definition, 666 

 Mechanical energy 



receptor excitation, 123 

 Mechanical pressure 



pre- and postsynaptic potentials and, 

 302 

 Mechanoreceptors, 380-383, 387-426 



see also Audition ; Ear 



discharges from, 392 



invertebrate, 380 



response to thermal stimulation, 454 



specificity of, 391 

 Medial lemniscal system, 396-409 



anatomical definition, 396 



direct bulbocortical pathways, 400 



direct spinocortical pathways, 400 



joint receptors projection in, 413 



modality components, 403 



path from dorsal column nuclei to 

 \entrobasal complex, 400 



patterns 



in dorsal column nuclei, 398 



m projection, 397 

 in response of neurons, 405 

 in thalamic relay nucleus, 399 

 physiological properties, 397 , 

 response, anesthesia and, 406 

 reticular activating system and, 42 1 

 touch-pressure and, 403 



Medulla oblongata 

 bulbar relays 



reticular formation and, 745 

 pain fibers in, 487, 488 



Medullary pyramid 



collateral activity of fibers, 306 



Membrane action potential : see Action 

 potential 



Membrane current 



space and time patterns of, 104 

 temporal relation to action potential, 

 104 



Membrane potential 



action potential and, 95, 100 

 constant inward current and, 1 1 2 

 definition, 102 



graded responsiveness and, 168 

 long polarizing currents and, i 1 2 

 membrane conductance and, 103 

 membrane current and, 93 

 membrane resistance and, 89 

 postsynaptic potential and, 161 

 rate of accommodation and, 127 

 sodium potential, [68 

 space and time patterns of, 1 04 

 spatial distribution 



action potential and, 103 

 threshold, 94 



stimulus duration and, 96 

 transducer action of synaptic mem- 

 brane and, 156 

 true refractory period and, 309 

 variation with brief voltage pulse, 1 00 



Membranes 



electrogenic evolution, 165 

 excitable and inexcitable, 154, 155 

 impedance during activity, 90 

 permeability at receptors, 143 

 resistance and after-potential, 1 15 



Menthol 



cold sensation due to, 455 



Mesencephalon 



hearing and, 589, 590 



pain fibers in, 488 



remembered pain from stimulation, 490 



Metrazol : see Pentylenetetrazol 



Microelectrodes 



damage due to, 270 

 double-barrelled, 275 

 identification of position, 267 

 micropipettes as, 263 

 recording from 

 axons, 268 

 motoneurons, 271 



