904 



INDEX. 



Thirst, sense of, 267 

 Thorax, as closed cavity, 571 



aspiratory action of, 587 



normal position of, 571 



origin of negative pressure in, 586 

 Thrombin, 416 

 Thrombokinase, 418 

 Thyroid, extirpation of, 772 



function of, 774 



internal secretion of, 772 



theory of (Cyon), 775 

 Tidal air, 580 



Tigroid substance in nerve cells, 127 

 Tissue proteid, 787 

 Tissues, exchange of gases in, 608 

 Tone (musical) of muscular con- 

 traction, 41 

 Tonicity of heart muscle, 510 



of muscle, 48 



of nerve centers, 144 

 Touch sense, path of, in cord, 169 

 Tracts in spinal cord, 157, 169 



of Burdach 159 



of Flechsig, 159, 164 



of Goll, 15.9 



of Gowers, 159, 164 

 Traube-Hering waves, 544 

 Treppe of muscular contractions, 33 

 Trigeminal nerve, area of distribu- 

 tion of, 228 

 nucleus of, 227 

 Trophic nerve fibers, salivary glands, 



672 



Trypsin, 664, 707 

 Tryptophan, 707, 874 

 Tiirck's method for reflex time, 141 

 Twelfth cranial nerve, nucleus of, 



230 



Tympanic membrane, 354 

 Tyrosin, 706, 874 



UNIPOLAR method of stimulation, 87 

 Urea, formation of, in liver, 737 



origin and significance of, 753 

 Ureters, contractions of, 761 

 Urethra, sphincter of, 763 

 Uric acid, 61 



in spleen, 739 

 significance of, 757 

 Urinary bladder, movements of, 762 

 nerves of, 765 



pigments, 400 

 Urination, physiological mechanism 



of, 761 

 Urine, composition of, 751 



nitrogenous excreta of, 752 



origin of acidity of, 748 



osmotic pressure of, 746 



reaction of. 751 



secretion of, 742 



secretion pressure of, 745 



Uterus, changes of, during menstrua- 

 tion, 842 



effect of, on mammary glands, 856 

 Utriculus, function of, 379 



VAGUS nerve, action of, on gastric 



secretion, 688 



on heart, 516 (see also In- 

 hibition) 



on pancreas, 701 

 as motor nerve to stomach, 643 

 nucleus of, 229 



relations of, to respiratory cen- 

 ter, 614 

 Vasomotor fibers, centers for, in cord, 



543 



in brain, 552 



to pulmonary arteries, 551 

 nerves, action of, in heat regula- 

 tion, 829 



antidromic impulses in, 548 

 course and distribution, 535, 545 

 general properties of dilators, 



545 



history of discovery of, 531 

 methods used to demonstrate, 



532 



of heart, 550 

 position of constrictor center. 



538 



reflex actions of, 540 

 rhythmical action of constric- 

 tor center, 544 

 to abdominal organs, 562 

 to dilator center and reflexes, 



546 



to genital organs, 562 

 to head, 561 

 to kidneys, 749 

 to skeletal muscles, 563 

 to trunk and limbs, 562 

 to veins, 564 

 tonic activity of, 538 

 Veins, vasomotor supply of, 564 

 Velocity of blood-flow (see Circu- 

 lation) 



pressure in blood-vessels, 460 

 Venous pulse, 475 



in brain sinuses, 558 

 Ventilation, principles of, 595 

 Ventral longitudinal bundle in spinal 



cord, 170 



Ventricle (see Heart) 

 Veratrin, effect of, on heart, 30 

 Vernix caseosa, 770 

 Vestibulo-spinal tract of spinal cord, 



170 



Vision (see Eye and Retina) 

 Visual acuity, 315 

 center in cortex, 192 



