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early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs blastodermic vesicle , blastula
cell division producing blastula from fertilized ovum cleavage , segmentation
(embryology) the repeated division of a fertilised ovum cleavage , segmentation
act of becoming pregnant; fertilization of an ovum by a spermatozoon conception
yellow endocrine tissue that forms in a ruptured Graafian follicle following the release of an ovum corpus luteum
animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds egg
membrane that forms around a fertilized ovum and prevents penetration by additional spermatozoon fertilization membrane
cell resulting from the union of an ovum and a spermatozoon (including the organism that develops from that cell) fertilized ovum , zygote
spermatozoon or an ovum germ cell , reproductive cell , sex cell
English physician and scientist who described the circulation of the blood; he later proposed that all animals originate from an ovum produced by the female of the species (1578-1657) Harvey , William Harvey
either of two twins developed from the same fertilized ovum (having the same genetic material) identical twin , monozygotic twin , monozygous twin
large dose of estrogen taken orally within 24 to 72 hours after intercourse; prevents implantation of a fertilized ovum and so acts as a contraceptive; commonly used after rape or incest morning-after pill
female gametocyte that develops into an ovum after two meiotic divisions oocyte
ovum develops by meiosis, cell from which oocyte
mature ovum after penetration by sperm but before the formation of a zygote ootid
egg cell or ovum, to produce ovulate
expulsion of an ovum from the ovary (usually midway in the menstrual cycle) ovulation
small or immature ovum ovule
nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote pronucleus
fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time superfetation
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