950 



INDEX 



Follicle ( s ) — (Continued) 

 Graafian — (Continued) 

 tertiary conditions in opossum ovary, 71 

 Follicle stimulating hormone (FSH), folli- 

 cle development, effects on, 72 

 response to, of seminiferous tubules, 24- 



25 

 role of in spermatogenesis, 24-25, 40-41 

 testis activity, effect on, 40 

 Follicular phase, of female reproductive 



cycle, 93 

 Fontanel (s), anterior, 696 

 definition of, 696 

 lateral, 696 

 posterior, 696 

 Food sources, for embryo, types of, 902 

 Foote, C. L., 892 

 Foramen caecum, 878 

 Foramen of Panizza, of crocodilian heart, 



753 

 Foramen ovale, of developing mammalian 



heart, 757 

 Forebrain, 812, 822 

 Foregut. 478, 600 

 Formative cells, of blastula, 341 



of opossum, 366 

 Formative tissue, of chick blastoderm, 319 

 Formic acid, in egg activation, 218 

 Fovea, of Ambystoma egg, 305 

 Fowl, common, spermatogenesis in, 153 

 egg and developing yolk body of, 755 

 Sertoli-cell conditions in, 139 

 young oogonia of, 154 

 zona radiata of egg of, 166 

 Fox, S. W., 225 



Fox, silver, seminiferous tubules in rela- 

 tion to seasons, 25 

 Fraser, E. A., 716 

 Fraternal twins, definition of, 380 

 Freemartin, 889 



lack of in marmoset, 892 

 Friedman modification, of Aschheim- 



Zondek pregnancy test, 927 

 Frog (see also Rana) 

 amplexus in, 201 

 blastopore closure in, 469 

 chondrocranium of, relation of, to adult 



skull, 616-(ilH 

 cleavage in, latitudinal plane of, 284 

 egg of, bilateral symmetry of, 162 

 blastocoel development of, 296, 297 

 ciliary action and external migration 

 of, 201 

 egg transport in, 201 



through oviduct, 907 

 gastrulation in, 406 

 heart of, early development of, 728 



Frog — (Continued) 



lateral vein development in, 738 



lungs, development of, 644 



marsupial, 916 



mesonephric kidney, development of, 

 780 



migration of egg in internal, 201 



muscles of, 707 



musculature associated with mandibular 

 visceral arch of, 717 



neural fold stage of, early, 462, 463 



neurenteric canal formation in, 469 



neurocranium, developmental stages of, 

 672 



of hoof of horse, 585 



olfactory organ development of, 843 



palatal conditions in, 615 



pancreas rudiments, development of, 628 



pectoral girdle of, 689 



pineal organ of, 881 



renal portal system of, 776 



reproductive structures of female, 66 



tadpole, development of teeth in, 607 



testis, development of, 794 



tongue of, 603 



urostyle of, 685 



vertebrae, development of, 685 



vitelline membrane of, 166 



vitelline vein development in, 737 

 Frog test, for pregnancy, 927 

 Frontal bone, development of in human, 



695 

 Fronto-nasal process, 844 

 Fructose, 34 



possible elaboration in seminal vesicle 

 and prostate, 34 



sperm utilization of, 34 

 FSH {see Follicle stimulating hormone) 

 Fundic region, of stomach, 621 

 Fundulus, red blood cell origin of, 733 

 Fundulus heteroclitus, killifish blastoderm 

 of, late, 367 



cleavage planes in, first, 287 



egg, characteristics of, 204t 



egg membranes of, 165 



fertilization, changes during, in egg of, 

 244 

 site of, 204t 



oxygen consumption in at fertilization, 

 244 



sperm entrance into egg, place of, 204t 

 Funiculus (Funiculi), 821 



dorsal, 821 



lateral, 821 



ventral, 821 

 Fiirbringer, M., 708 



