INDEX. 



783 



TJtriculus of labyrinth, 574 

 Uvula in relation to voice, 447 



Yagina, structure of, 639 

 Vagus nerve. See Pneumogastric. 

 Yalve, ileo-caecal, structure of, 266 

 Valves of heart, 103 



action of, 117 



bicuspid or mitral, 103 



semilunar, 104 



tricuspid, 103 



of lymphatic vessels, 303 



of veins, 114 



Valvulse conniventes, 267 

 Vas deferens, 640 

 Yasa efferentia of testicle, 641 



recta of testicle, 641 



vasorum, 109 

 Yascolar area, 669 

 Vascular glands, 383 



in relation to blood, 393 



several offices of, 393 

 Vascular system, development of, 684 

 Yaso-constrictor nerves, 151 

 Yaso-dilator nerves, 151 

 Vaso-motor influence on blood pressure, 



147 etseq. 

 Vaso-motor nerves, 147 



effect of section, 148 et seq. 



influence upon blood-pressure, 148 

 Yaso-motor nerve-centres, 149, 498 



reflection by, 149 



Vegetables and animals, distinctions be- 

 tween, 10 

 Veins, 112 



blood-pressure in, 157 



circulation in, 156 et seq. 



rate of, 159 



cardinal, 692 



collateral circulation in, 114 



cranium, 162 



development, 692 



distribution, 112 



effects of respiration on, 200 



influence of expiration, 202 

 inspiration, 200 



influence of gravitation in, 158 



parietal system of, 693 et seq. 



pressure in, 157 



rhythmical action in, 157 



structure of, 113 



systemic, 112 



umbilical, 694 



valves of, 114 



velocity of blood in, 160 



visceral system of, 692 et seq. 

 Velocity of blood in arteries, 159 

 in capillaries, 160 

 in veins, 160 



of circulation, 158 



of nervous force, 458 



conditions modifying, 458 

 Vena ports, 275 



Venae hepaticse advehentes, 692 



revehentes, 692 

 Ventilation, 199 

 Ventricles of heart, 99 



capacity of, 116, 127 



contraction of, 116 



dilatation of, ib., 127 



force of, 128 



of larynx, office of, 447 



lateral, 505 

 Ventriloquism, 449 



Vermicular movement of intestines, 293 

 Vermiform process, 266 

 Vertebrae, development of, 678 

 Vertebral plate, 666 

 Vesicle, germinal, 636 



Graafian, 636 

 Vesicula germinativa, 636 

 Yesiculae seminales, 643 



functions of, 654 



structure, 643 

 Vestibule of the ear, 570 

 Vibrations, conveyance of, to auditory 



nerve, 575 et seq. 

 Vidian nerve, 538 

 Yilli in chorion, 673 



in placenia, 677 

 Villi of intestines, 264 



action in digestion, 265 

 Visceral arches, development of, 681 



connection with cranial nerves, 683 



laminae or plates, 668 

 Visceral plates, 668 

 Yiscero-inhibitory nerves, 628 



motor, 628 

 Vision, 584 



angle of, 611 



at different distances, adaptation of eye 

 to, 596 et seq. 



centre, 529 



corpora quadrigemina, the principal 

 nerve-centres of, 500 



correction of aberration, 602 et seq. 

 of inversion of image, 609 



defects of, 600 et seq. 



distinctness of, how secured, 598 et seq. 



duration of sensation in, 605 



estimation of the form of objects, 613 

 of their direction, 613 

 of their motion, 613 

 of their size, 612 



field of, size of, 611 



focal distance of, 599 



impaired by lesion of fifth nerve, 537 



influence of attention on, 614 



modified by different parts of the 

 retina, 617 



purple, 608 



single, with two eyes, 619 

 Visual direction, 613 



Vital or respiratory capacity of chest, 184 

 Vital capillary force, 156 

 Vitellin, 738 

 Vitelline duct, 704 



membrane, 658 



