1042 



INDEX. 



Tensor tympani muscle, function of, 



394 



Tenth cranial nerve, nucleus of, 249 

 Testis, internal secretion of, 884 

 Tetanus, number of stimuli necessary 

 for, 45 



of muscle, 41 



opening and closing, 90 

 Theobromin, 851, 926 

 Third cranial nerve, nucleus of, 246 



heart sound, 555 

 Thirst, sense of, 292 

 Thorax as closed cavity, 644 



aspiratory action of, 661 



normal position of, 645 



origin of negative pressure in, 660 

 Thrombin, 456 



method of obtaining, 457 

 Thrombogen, 457 

 Thrombokinase, 461 

 Thromboplastic substances, 460 

 Thrombosis, 454 

 Thyroid, extirpation of, 868 



function of, 871 



internal secretion of, 867 

 Tidal air, 654 



Tigroid substance in nerve-cells, 134 

 Tissue protein, 896 

 Tissues, exchanges of gases in, 683 

 Titration alkalinity, 419 

 Tone (musical) of muscular contrac- 

 tion, 44 

 Tonicity of heart-muscle, 579 



of muscle, 51 



of nerve-centers, 153 

 Tonometer, 675 

 Tonus, myogenic, 57 



neurogenic, 57 



Touch sense, path of, in cord, 174 

 Tract of Lissauer, 168, 169 

 Tracts in cerebellum, 235 



in spinal cord, 165 



of Flechsig, 167 



of Gowers, 167 



of Helweg (olivospinal) , 181 



of Monakow (rubrospinal), 180, 199 

 Traube-Hering waves, 616 

 Treppe in muscular contractions, 34 

 Trigeminal nerve, area of distribu- 

 tion of, 247 

 nucleus of, 247 

 Tritanopia, 355 

 Trophic nerve-fibers, salivary glands, 



758 



Trypsin, 747, 792 

 Tryptophan, 795 



Turck's method for reflex time, 149 

 Twelfth cranial nerve, nucleus of, 



251 



Tympanic membrane, 386 

 Tyrosin, 794, 1009 



reagent, 1012 



UNCONDITIONED reflexes, 190 

 Unipolar method of stimulation, 91 

 Unitarian theory (blood-corpuscles), 



443 

 Urea, formation of, in liver, 829 



origin and significance of, 847, 1009 

 Ureters, contractions of, 857 

 Urethra, sphincter of, 858 

 Uric acid, 64, 850 

 in spleen, 832 

 significance of, 850 

 Uricolytic enzyme, 852 

 Urinary bladder, movements of, 857 

 nerves of, 859 



pigments, 845 

 Urination, physiological mechanism 



of, 857 

 Urine, composition of, 843 



nitrogenous excreta of, 845 



origin of acidity of, 840, 843 



reaction of, 843 



secretion of, 834 



pressure of, 838 



Uterus, changes of, during menstrua- 

 tion, 968 



effect of, on mammary glands 983 

 Utriculus, function of, 412 



VAGUS nerve, action of, on gastric 



secretion, 774 



on heart, 581. See also In- 

 hibition. 

 on pancreas, 788 



as motor nerve to stomach, 724 



nucleus of, 249 



relations of, to respiratory cen- 

 ter, 689 



Valin, 793, 1009 



Vasomotor fibers, centers for, in cord, 

 615 



in brain, 634 



to pulmonary arteries, 623 

 nerves, action of, in heat regula- 

 tion, 954 



course and distribution, 606, 616 



general properties of dilators, 617 



history of discovery of, 602 



methods used to demonstrate, 603 



of heart, 622 



position of constrictor center, 609 



reflex actions of, 611 



rhythmical action of constrictor 

 center, 615 



to abdominal organs, 636 



to dilator center and reflexes, 618 



to genital organs, 636 



to head, 634 



to kidneys, 841 



to skeletal muscles, 637 



to trunk and limbs, 635 



to veins, 638 



