Template talk:Ref-Hamilton1943

A METHOD for obtaining and photographing living ova was discussed. An unsegmented human tubal ovum at the stage of the second maturation spindle was recoveredonthe17thdayofthemenstrualcycle, Thepreviousmenstrualcycletothat inwhichtheovumwasrecoveredwasof30days'duration. Theovumwassurrounded by the corona radiata cells and the zona pellucida appeared as a structureless membrane. The light yellowish, refractile vitellus completely filed the zonal cavity in the living ovum. Onhistologicalsectionthesecondmaturationspindleispresent. A second ovum was recovered on the 16th day of a presumed 28-day cycle. The ovum was free from cumulus cels and many sperms were seen in the zona pellucida. The third specimen, an embryo partially implanted in the uterine endometrium, was found after hysterectomy on the 25th day after the beginning of the last menstrual periodinawomanwhohadacycleof28days. Theembryo,partiallycoveredbyuterine epithelium,projectedasasmallelevationfromtheposterioruterinewall. Thetropho- blast is differentiated into a cytotrophoblast and a syncytiotrophoblast; the latter is thickestovertheembryonicpoleofthechorionicvesicle. Anamnioticcavityispresent andayolksacisintheprocessofformation. Theembryoisestimatedtobe10%daysold, The time of ovulation in woman was discussed.