human ovum


Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to human ovum: oogenesis
Enlarge picture
HUMAN OVUM

human ovum

The female gamete, required for reproduction. The ovum develops from an oogonium within the graafian follicle of the ovary and matures through the meiotic process of oogenesis. A mature ovum is about 0.13 to 0.14 mm (0.0051 to 0.0055 in) in diameter. At ovulation, the ovum is bounded by a translucent cellular membrane (the zona pellucida), which is connected to a layer of follicular cells (the corona radiata); these cells enclose the cytoplasm, nuclei, and chromatin material. The exact time during which a human ovum is capable of fertilization and further development before degenerating is not known; however, it is probably 24 hr. See: illustration; oogenesis; ovulation
See also: ovum
References in periodicals archive ?
embodied in [section] 122, which prohibits the sale of human ovum or the
(c) a human ovum into which the nucleus of a cell of a non-human life form has been introduced;
Vancouver--One of the paradoxes of our time is that people who emphasize the simple, scientific fact that when a human sperm fertilizes a human ovum a new human being comes into existence, are looked on as fanatics, religious fundamentalists, even though this proposition by itself has nothing to do with religion.
They say specifically that their analysis explores the case of transferring the nucleus of an adult human's somatic cell to a human ovum with the aim of creating a child.
I'll bet if someone discovered a gene for religiosity, they would be in favor of splicing it into every single human ovum.
Irrefutable scientific fact demonstrates that fertilisation of a human ovum by a human sperm makes the beginning of a new human life which is genetically distinct from both parents.
In cloning, the nucleus of a human ovum (egg) is removed and replaced with the nucleus from a body cell.

Full browser ?