INDEX 



Villi, floating, 591 



Visceral mesoderm, 45, 60, 80, 81, 96, 98, 108 



musculature, see Musculature, -visceral 



neurones, sympathetic, 421 



or splanchnic structures, 428 

 Visual area of pallium, 440, 527, 528 



cortex, 527 

 Vitelline arteries, 210, 569 



circulation, 189 



duct, 581 



membrane, 2 



plexus, 1 86 



veins, 187, 570 

 Vitellus, 2 

 Vitreous, 545 



humor, 545 

 Vocal cords, superior, or false, 331 



true, 331 



Volar arch, superficial, 217 

 Voluntary muscle, striated, histogenesis of, 276 



origin of, 262, 263 

 Vomer, 160, 162 

 Von Baer, XIII 

 Von Baer's law, 354 

 Von Loewenhoek, concerning the discovery of 



the spermatozoon, XIII 

 Von Spec's embryo, 101, 102, 109 



"Waters," the, 581 



Webs between digits, 121 



Weight of embryos, 122 



Wharton's jelly, 597 



White columns (see also Dorsal funiculus), 473 



matter of cerebral hemispheres, 524 

 of cord and segmental brain, 474 



ramus communicans, 457, 462 

 Wiedersheim, concerning the mammary gland, 



4i3 

 concerning duplicity with double gastru- 



lation, 608 



Wieman, concerning spermatogenesis, 16 

 Wilson, E. B., concerning fertilization, 28 



Wilson, J. F., concerning intermediate region 

 in the cord, 494 



concerning intermediate plate, 494 

 Winslow, foramen of, 348 

 Wirsung, duct of, 320 



Wlassak, concerning the myelin sheath, 464 

 Wolffian duct, 346 



ridge, 358 

 "Wolf's snout," 180 



theory of epigenesis, XIII 

 Woods, concerning sex cells, 374 



X-chromosome, 15, 1 6 

 Xiphoid process, 154 



malformations of, 605 

 Xiphopagus, 605 



Y-chromosome, 15, 16 

 Yolk, 3 



lack of, in Mammals, 572 



plug, 56 



sac, 82, 95, 96, 100, 101, 103, 104, 105, no, 



in, 567 



formation of in chick, 567 

 function of, 568 

 in Mammals, 572, 574 

 in man, 581 

 stalk, 109, 112, 286, 568, 575 



Zander, concerning the nails, 409 



Ziegler, concerning malformations of neural 

 tube, 615 



Ziegler's fusion theory of symmetrical duplic- 

 ity, 607 



Zona pellucida, 2, 379 

 radiata, 379 



Zonula Zinnii, 548 



Zonular placenta, 578 



Zygomatic bone, 162 



Zymogen granules, 323 



Zygote, 27 



Printed in the United States of America 



