Journal of Morphology, 26. köideGinn & Company, 1915 |
Other editions - View all
Common terms and phrases
albino rat anatomy anlage antimesometrial appear basal Bdellodrilus blastodermic vesicle body branchial arches cartilage chromatin chromosomes ciliation cleavage connective tissue cytoplasm demibranch dentine described differentiation distal division ectoderm ectomeres ectoplacental cone edge egg-cylinder electroplax embryo enamel enamel-organ epibranchial epihyal epithelial epithelium extrabranchial extraembryonic ectoderm folds formation germ bands germ layers gill granules hyal arch hyomandibula hypophysis incisor inferior lobes inner insemination JOURNAL OF MORPHOLOGY lateral layer ligament lumen macromere margin material median membrane mesoblast mesoderm mesometrial muscle nerve normal nurse cells observed oocyte oral groove outer ovary oviduct ovum pairs palp parietal pharyngobranchial plane PLATE portion posterior end posteriorly present primary embryonic ectoderm proamniotic cavity region rods secondary nuclei segmentation cavity shown in figure side siphon Sobotta somatoblast spindle stained structure superior lobe surface tion tooth tracts upper uterine horn uterus vena jugularis ventral visceral mass wall Zool
Popular passages
Page 259 - ... maturation and fertilization phenomena pertaining to the albino rat, unless otherwise credited, have been drawn from the account of Sobotta and Burckhard, whose account is accompanied by excellent figures. Long has studied in living ova of mice and rats the phenomena of maturation and fertilization. Tubal ova were placed in Ringer's solution on an especially constructed slide and spermatozoa introduced. It was possible to seminate the ova of rats with rat spermatozoa and to observe the formation...
Page 283 - ... rate of transit within the oviduct. The regularity of the rate of transit as revealed in the summary may perhaps speak for the trustworthiness of the age data as concerns my material. It will be observed that the ova approach the uterine end of the oviduct while in the 2-cell stage (see table 10); transit through the last portion of the oviduct, where the greater part of the segmentation occurs, being relatively slow. It is hoped that these data, for the accuracy of which I am dependent on reconstructions,...
Page 292 - ... figures to be presented. Widakowich is inclined to believe that the form of the blastodermic vesicle of the rat is in a measure dependent on the general form of the space in which it is lodged. He figures two vesicles (figs. 1-2) one of which is nearly spherical, the other of distinctly oval form. Duval (figs. 73-83) presents vesicles having ovoid, triangular, and spherical forms. Christiani's figures covering these stages, are too schematic to be of any value in drawing conclusions. I fear Robinson's...
Page 259 - ... minutes to two or more hours after the spermatozoa are introduced. The constriction may be finished three-fourths of an hour later." "The first appearance is an elevation clearer than the rest of the cell. The swelling becomes higher, and at one side of the elevation there appears a depression which is the beginning of the constriction which presently encircles the whole swelling and cuts it off from the egg." Nothing could be said as to the changes which the chromatin undergoes after the spermatozoa...
Page 227 - FR 1911. Studies of fertilization in Nereis. I. The cortical changes in the egg: II. Partial fertilization.
Page 358 - Recherches sur les fonctions du corps jaunc gestatif. Jour, de Physl. et de path, gener. DANIEL, JF 1910 Observations on the period of gestation in white mice.