274 



INDEX 



UMBILICAL CORD, formation of, 85 . gj 1 -^ 



opening, primitive, formation of anterior 

 lip of, 53 



vesicle, 55 

 Umbilicus, position of, at early stage, 90 



closure of, 163 

 Uncus, 118, 122 



Ungulates, allantoic vesicle in, 55 

 Urachus, origin of, 55, 185 

 Ureter, rudiment of, 182 

 Urethra, 185, 203 



Urinary bladder, development of, 185 

 Urodaum, Fleischmann, 203 

 Urogenital fossa, 164 



system, development of, 177 



sinus, 164, 185 

 Uterus, changes in, in pregnancy, 67, 68, 69 



regeneration of mucous membrane of, 

 after parturition, 69 



formation of, 194 

 Uterus masculinus, 194 

 Utricle, development of, 147 



prostatic, 194 

 Uvea, 140 

 Uvula of cerebellum, 110 



of soft palate, 155 



VAGINA, development of, 195 



vestibule, origin of, 185, 194 

 Valve of Vieussens, 110 



Thebesius, 213 

 Valves, auriculo-ventricular, 211 



semilunar, 216 



venous, 211 



in lymphatic vessels, 236 

 Vas deferens, 192 

 Vasa aberrantia, 192 



efferentia, 192 



Vascular area, development of, in lower 

 mammals, 59 



formation of embryonic blood - vessels 

 from, theories of, 61 



rings round duodenum, 224 

 Veins, development of, 224 



ascending lumbar, 228 



azygos, 228 



cardinal, 226 



cephalic, 233 



hepatic, 224 



iliac, transverse, 208 



iliac, internal, 226 



iliac, external, 226 



inferior cava, 226, 228 



innominate, 232 



intercostal, superior, 222 



jugular, internal, 229 



jugular, external, 231 



jugular, primitive, 229 



longitudinal, superior, 229 



oblique, of Marshall, 232 



portal and hepatic, 224, 225 



radial, 233 



saphenous, long, 233 



saphenous, short, 233 



sciatic, 226 



subcardinal, 227 



subclavian, 231 



superior cava, 232 



suprarenal, left, 228 



tibial, 233 



Veins, ulnar, 232 



umbilical, 226 



viteUine, 206, 224 

 Velum, inferior medullary, 110 



superior medullary, 110 



interpositum, 113, 121 



primitive, 157 

 Vena ascendens, or ductus venosus, 226 



capitis lateralis, 229 



cerebralis posterior, 229 



cerebralis media, 229 



cerebralis anterior, 229 

 Venae advehentes and revehentes, 224 

 Ventricle, terminal, of cord, 103 



cerebellar, 110 



formation of primitive common, 208, 214 



primitive common, first appearance of 

 septum in, 209 



lateral, 116 



fifth, origin of, 122 

 Verdun, on thyroid, 169 

 Vermis of cerebellum, 110 

 Vernix caseosa, 92 

 Vertebrae, development of, 250 

 Vesicle, germinal, 9 



umbilical, formation of, 55 



blastodermic, 26 



lens, development of, 137 



auditory or otic, 145 



of thymus, 191 



seminal, origin of, 192 



optic, appearance of, 82 



optic, development of, 106, 111, 136 

 Visceral arches, origin of, 223 



musculature of head, 128 



pouches, 158 

 Vitelline loop of intestine, 161, 162 



duct, formation of, 55 



stalk, 161 



veins, 206, 224 

 Vitreous chamber, rudiment of, 137 



body, development of, 141 

 Vriese, de, on formation of basilar artery, 223 



development of arteries of the limbs, 224 



WALDEYER, germinal epithelium of, 186 



on placental sinuses, 74 



zona radiata, 8 

 Webster, on placenta, 74 

 Weismann, theory of, 21 



Weiss on development of basis cranii in rat, 

 254 



development of primitive vertebras in rat, 

 250 



division of sclerotomes in mammalia, 250 

 Wijhe, v., cell- chain theory of nerve-fibres, 99 



on head-segments in Selachians, 249 



placodes as branchial sense-organs, 128 



theorv of head-segmentation, 249 

 Willis, circle of, 222, 223 

 Wilson, J. T., on folds on wall of neural tube, 



103 

 Wilson, Ed. B., on artificial parthenogenesis, 



15 

 Winiwarter, on germinal epithelium, 191 



synapsis in oogenesis, 22 

 Winslow, foramen of, 242, 244 

 Wirsung, duct of, 175 

 Wolffian body, development of, 178 



fate of, in male, 192 



