INDEX. 



699 



Trachea, 337 



Tracts of spinal cord, 449 



Trigeminal nerve, 537 



Trypsin, 200 



Tiirck, column of, 448 



Tympanum, 637 



U. 



Umbilical cord, 663 



Upper air-passages, respiratory move- 

 ments of, 353 

 .Urea, 410 



seat of formation, 422 

 Uric acid, 422 

 Urine, 421 



composition of, 421 

 mechanism of secretion, 428 



influence of blood composi- 

 tion, 435 

 influence of nerve system, 



432 

 relation of blood-pressure 



to, 429 

 Uterus, 652 



V. 



Vagus nerve, 552 



influence on heart, 292 

 Valves of heart, 276 

 Vasa deferentia, 656 

 Vascular apparatus, 296 



nerve mechanism of, 327 



glands, 411 

 Vaso-motor center, 331 



nerves, 327 

 Veins, 299 



Velocity of blood, 312, 316 

 Vertebral column, 61 

 Vesiculae seminales, 656 

 Villi, 222 



Visceral muscle, 97 



Vision, 598 



accommodation, 614 

 astigmatism, 622 

 binocular, 628 

 color perception, 634 

 functions of retina, 625 

 hypermetropia, 621 

 myopia, 621 

 presbyopia, 620 



Visual angle, 613 



Vital capacity of lungs, 357 



Vocal bands, 576 

 sounds, 580 



Voice and speech, 582 



Volume of pulse, 320 



W. 



Walking, 97 



Water, amount of, in the body, 37 

 Watery vapor in breath, 360 

 Wernicke's pupillary reaction, 531, 

 White blood-corpuscles, 254 

 function of, 257 

 migration of, 323 

 origin of, 257 

 Wrisberg, nerve of, 545 



535 



Yellow spot, 602 



Y. 



Z. 



Zona pellucida, 660 



Zymogen, 165 



pepsinogen, 182 

 ptyalogen, 165 

 trypsinogen, 202 



