474 



SUBJECT INDEX 



Prepotentials, 197, 291, 300 (see also 

 Miniature postsynaptic potential; Minia- 

 ture potential) 



Preservation of information, 401 



Presynaptic block, 23 



Presynaptic inhibition, 47, 55flF., 11 Iff., 353 



Presynaptic interaction, 18 



Presynaptic terminals, 95, 98, 413 



Primary afferent fibers, 24 



Primary sensory neurons, 42, 326, 327, 330 



Primitive central nervous system, 395ff. 



Probability of firing, 401ff. 



Procaine, 11,93, 345 



Propagated action potentials, 149 



Proprioceptive afferents, 22 



Prothoracic gland, 448 



Protothaca, 139 



Protothaca staminea, 138 



Puctada martensi, 136 



Purkinje neurons, 45 



Pycnoscelus surinamensis, 451 



Pyramidal tract, 419 



Quantal release of transmitter. 111, 112 



Radioactive isotopes in analysis of synaptic 



inhibition, 116, 119, 121, 132, 144ff. 313 

 Ragworm, 406 

 Raia electroplaques, 9 

 Random connections, neuropile, 395, 396 

 Rat atrium, 125 

 Rebound {see also Postinhibitory excitation; 



Postexcitatory inhibition ; "Off" response; 



"On" response) 



excitation 154, 318ff. 

 Receptor cells, 241 ff., 285ff., 318ff., 326ff. 

 Reciprocal inhibition, 38 

 Reciprocal innervation, 25 

 Recurrent collaterals of Golgi, 61 

 Recurrent conditioning, 27 

 Recurrent excitation, 69 

 Recurrent facilitation, 27 

 Recurrent inhibition, 6 Iff., 64, 66, 255, 275 



physiological role of, 66 

 Recurrent inhibitory system, spinal cord, 26 

 Regulator fibers of crustacean heart, 144ff. 

 Remote inhibition, 23, 353 

 Renshaw cells, 5, 27, 35, 36, 61, 66, 67, 347 



not automatic, 68 

 Renshaw inhibition, histological basis of, 



35ff. 

 Repolarization, 24 

 Resistance changes, produced by light, 197 



to inhibition, 64 

 Respiratory inhibition, 2 

 Reticular formation, 12, 37, 38, 357, 374, 423 



Retina, generator potentials, 333 



inhibitory interactions in, 241 ff. 

 Reversal of inhibitory synaptic current, 73 

 Reversal potential of i.p.s.p. {see Equili- 

 brium potential) 

 Rhodopsin, 196 



Role of inhibition, 25 {see also 318ff.) 

 Rotation of acetylcholine-sensitive sites, 138 



Salivary gland, hyperpolarization, 333, 335 



Salt-contraction, 378 



SCN-, 313 



Scratch reflex, 2, 5 



Sea-urchin, esophagus, 358 



Secondary degeneration of synapses, 32 



Secondary sensory cells, 327 



Secondary vestibular fibers, 38 



Seizures, 385ff. 



Selfinhibition, 261 



Sensitization to light by dyes, 195 



Sensory field, 404 



Sensory ganglia, 42 



Sensory input, centrifugal modulation, 419 



Sensory neurons {see Primary sensory cells; 



Receptor cells; Secondary sensory cells) 

 Sepia stained giant axon, 195, 196, 199, 210, 



215,223 

 Serotonin {see 5-Hydroxytryptamine) 

 Shadow reflex, 323 

 Sheep myocardium, 132 

 Sieve hypothesis, 83, 89 

 Silent period, 279, 280, 318 

 Simple inhibition, 105, 364 

 Sinus venosus, eel heart, 114 



effect of vagus stimulation, 115 



of tortoise, 115 

 Sodium {see Na+) 

 Sodium pentobarbital, 440 

 Somesthetic cortex, 415 

 Spatial summation, 50, 258, 259, 278 

 Spinal cord intemeurons, 19, 20, 24, 26, 41, 



66, 67, 210 {see also Renshaw cells) 

 Spindle and tendon receptors, 27 

 Spontaneous activity (autoactivity), 42, 



179ff., 200, 201,299 



in regulator neurons, 151 



of presynaptic terminals, 97, 209 

 Squid axon, 11, 89 {see also Sepia stained 



giant axon) 

 Stained axon as detector of infra-red, 214 

 Stenarchus albifrons, 337 

 Stimulation, definition, 325 

 Stimulus, concept of, 318ff. 

 Stretch deformation of dendrites, 289 

 Stretch receptor cells of crayfish {see Crus- 

 tacean stretch receptors) 

 Stretch reflex, 27, 28, 64, 65 



