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 ?
According to his research, the human ovum carries an electrical charge, either positive or negative, which changes during the fertile period.
a) a human ovum that has been fertilized by a sperm of a non-human life form;
Late last year scientists at a privately funded lab in Massachusetts successfully demonstrated early stages of growing stem cells in a petri dish by manipulating a human ovum.
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.

Full browser ?