1437 



Rigidity- 

 description of, 865 

 mechanism of, 919 

 muscle length, 887 

 surgical treatment, 887 



Rolandic motor area: see Cerebral cortex 

 (area 4) 



Rotation 



eye movements in response to, 1095 



Ruffini endings 

 posture and, 1070 



Salivation 



body temperature control and, 1 185 



cortical stimulation and, 1360 



emotion and, 1 1 69 

 Salivary glands 



denervation and, 993 

 Salivary reflex 



mediation, 960 

 Schizophrenia 



body temperature control in, 1185 

 Second somatic area 



ablation of, 810 



function, 809 

 Self-stimulation tcchnic 



sex behavior and, 1236 

 Septal area 



connections with hippocampus, 1378 

 Sensorimotor cortex 



activities, 797-828 



afferents from thalamus, 814 



difficulties of study, 797 

 Sensorimotor integration 



see also Motor activity 



ablation of cortical motor area and, 

 807, 808 



afferents to cortex, 814-818 



after cortical ablation, 808-814 



caudate nucleus and, 815 



cerebellocerebral interrelationships and, 

 815 



cerebellum and, 815 



efferents from cortical areas, 818-822 



globus pallidus and, 815 



of motor activities, 822-829 



putamen and, 815 



stimulation of 



cortex and, 808-814 

 cortical motor area, 803-806 



striopallidothalamocortical interrela- 

 tionships, 815 

 Serotonin: see 5-Hydroxytryptaminr 

 Sex drive 



definition, 1226 



methods of assessing, 1226 

 Sexual behavior : see Reproductive be- 

 havior 

 Shivering 



body temperature control and, 1 186 



description of, i 187 



hypothalamus and, 966 



Skin 



see also Cutaneous blood flow 



afTerent fibers 

 diameter, 930 

 modalities of sensation, 933 



receptors, posture, 1070 

 Sleep 



caudate nucleus stimulation and, 873 



induction of, i 288 



production of, 91 1 



reticular formation, 1287 

 Sleep-waking mechanisms 



hypothalamus and, 971 

 Sneezing reflex 



mediation, 960 

 Sodium chloride overloading 



neurosecretory material and, 1048 

 Sokownin crossed bladder reflex 



explanation, 990 

 Somatomotor responses 



cortical stimulation and, 1355 

 Somatosensory area I 



antidromic and orthodromic stimula- 

 tion, 849 



characteristic Betz cell response, 850 



contra- or ipsilateral stimulation, 848 



pyramidal libers from, 846 

 Spasticity 



control, cerebral cortex and, 791 



muscle length, 887 

 Sperm transport 



oxytocic hormone and, 1033 

 Spinal animal 



body temperature control, 1 180 



description, 781 



history, 782 



locomotion in, 1084 



postural reflexes, 784 



rebound, 788 



recovery of reflexes, 782 



stretch reflexes, 784 



vasoconstriction in, 1 1 38 



viscerosomatic reflexes in, 954 

 Spinal cord 



autonomic mechanisms in, 952 



course of pyramidal tract in, 858 



cranial control of, 929 



distribution and properties of afferents, 



934 

 internuncial circuits, characteristics, 



937 



interrelations cortex, cerebellum and 

 extrapyramidal motor system, 898 



mechanisms involscd in somatic activ- 

 ities, 929-948 



neurosection in, 1056 



pathways of bladder control, 1222 



respiration centers, 1 1 15 



sex behavior and, 1229 



sympathetic vasodilator nerves and, 

 1 152 



vasoconstrictor representation, i 138 



Spinal mechanism 



afferent fibers, 931-933 



afferent paths, 930 



cutaneous reflex action, 944-947 



liaison, afferent and motor paths, 934- 

 938 



motor paths, constitution, 933, 934 



muscular reflex action, 938-944 



somatic activities and, 929 

 Spinal reflexes 



see also Reflexes 



afferent paths, 930 



coordination, 785 



deterioration, 783 



extrapyramidal motor system, 909, 922 



pattern of, 784 



recovery, 782 

 Spinal shock 



central nervous system counter action, 



783 



description, 956 



nature of, 783 

 Spinal vasomotor mechanism 



neurons, carbon dioxide tension, 11 46 



neurons, oxygen tension, 1 1 46 



pathways, description, 1 1 39 



reflexes, 1 138 

 Spinothalamic system 



reticular formation and, 1282, 1293 

 Spreading depression 



relation to suppression, 813, 1351 

 Startle reaction 



description, 907 

 Statokinetic mechanisms 



brain-stem centers, 890-896, 92 1 



definition, 890 



sensory systems responsible, 890 

 Status marmoratus 



corpus striatum in, 878 

 Stretch flexor reflex 



description, 941 

 Stretch reflexes : see Myotatic reflexes 

 Striatum : see Corpus striatum 

 Strionigral system 



as efferent path for extrapyramidal 

 motor system, 869 

 Striopallidocortical systems 



as efferent path for extrapyramidal 

 motor system, 87 1 

 Striopallidoreticular system 



as efferent path for extrapyramidal 

 motor system, 869 

 Striopallidothalamocortical interrelation- 

 ships 



sensorimotor integration and, 815 

 Strychnine 



cerebeUar activity and, 1255 



systemic administration, 1255 

 Substantia nigra : see Nucleus niger 

 Sucking reflex 



mediation, 960 

 Sulfhydryl groups 



in neurosecretory material, 1047 



