Index 



ACA ratio: sec Accommodation 

 Acceleration stimuli: see Equilibrium 

 Accommodation, 654-656, 660-664 



ACA ratio 



definition, 664 



accommodative convergence and, 664 



age and, 664 



convergence and, 662 



definition, 656 



innervation controlling, 662 



lens and, 660 



limiting factor, 664 



mechanism, 660 



night myopia and, 664 



phoria and, 664 



pupils and, 662 



refracting mechanism and, 655 



response to blur, 663 



.Scheincr principle and, 659 



sky myopia and, 664 



threshold level and, 97 



with fixed stimulus, 660 



zero level, 659 

 Accommodative convergence: see Con- 

 vergence 

 Acetylcholine 



see also Cholinergic transmitter; Trans- 

 mitter substances; Cvu'arc; Neuro- 

 muscular transmission ; Parasym- 

 pathin 



arousal and, 1 79 



as pain excitant, 479 



as transmitter substance, 1 39, 1 55, 

 166, 179, 200, 230 



characteristics, 231 



competition with curare, 210 



depolarization and, 210 



electrically inexcitable membrane and, 



■55 

 intermittent release, 207 

 mode of action, 2 1 o 

 mollusc muscle and, 248 

 sodium and, 210 

 substances blocking, 139 

 thermoreceptors and, 455 



Action potential 



see also Evoked potential 



abolition, 100 



absolute refractory period and, 308 



activity and, 378 



auditory nerve, 575 



axoplasm, longitudinal current and, 

 103 



current theories, 1 1 7 



excitability and, 99 



giant axon, 84 



junctional activity and, 205 



membrane 

 definition, 84 



membrane potential, 100 

 time course and, 103 



monophasic, 77 



muscle in invertebrates, 242 



Na theory and, 1 18 



non-linear phenomena, 95 



polarizing current and, 1 1 2 



prolonged abolition, loi 



retina, 617 



temporal relation to membrane cur- 

 rent, 104 

 Adaptation 



see also Photic adaptation; Scoptic 

 adaptation 



definition, 125 



double pain and, 473 



in pain receptors and fibers, 468, 473 



in thermal receptors, 456 



retinal receptive fields and, 705 



taste sense and, 524 



to touch-pressure, 403 



vestibular mechanism and, 555 

 Adrenaline : see Epinephrine 

 Adrenergic transmitter, 218-230 



see also Epinephrine; Norepinephrine; 

 Dopamine; Isopropylnorcpincph- 

 rine; Catechol amines; Transmitter 

 substances 



biosynthesis of, 220-222 



characteristics, 218, 220 



dopamine as, 229 



763 



epinephrine as, 140, 179, 218, 229 



exhaustibility, 227 



identification of, 218-220 



iproniazide and, 224 



isopropylnorepinephrine as, 229 



other than norepinephrine, 228 



release, 222-227 



removal of, 227, 228 



remote effects, 225 



stimulus frequency and, 222 



storage, 221 

 After-discharge 



classification, 312 



cortical, thalamic connections, 307 



decamethoniuni iodide, 306 



definition, 305 



isolated cortex, 306 



medullary pyramid, 306 



rhythmic, 307 



specific neuronal circuits and, 307 



types, 305 

 After -potential 



definition, 1 15 



fiber type and, 1 15 



membrane resistance and, 1 1 5 



negative, 1 15 

 Age 



electroencephalogram, human 

 beta activity, 297 

 delta activity, 296 

 theta activity, 297 



lens structure and, 662 



taste bud distribution and, 508 

 Alcohol dehydrogenase 



visual pigments and, 673 

 Alkaline phosphatase 



in olfactory mucosa, 539 

 All-or-none response, 64, 76, 79 



conversion to graded, 168 



lack in protozoa, 370 

 Alteration of response theory: see Vision 

 Aluminum cream 



lesions due to, 351 



