Egg cell - Wikipedia, the free encyclopedia

--------------------

** Egg cell **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
"Ovum" redirects here. It is not to be confused with Ovule.

/Ovum/
Gray3.pngA human ovum with corona radiata surrounding it
Anatomical terminology

The *egg cell*, or *ovum*, is the female reproductive cell (gamete) in
oogamous organisms. The egg cell is typically not capable of active
movement, and it is much larger (visible to the naked eye) than the motile
sperm cells. When egg and sperm fuse, a diploid cell (the zygote) is
formed, which gradually grows into a new organism.

*Contents*

· 1 Animals

· 1.1 Human and mammal ova
· 1.2 Ooplasm
· 1.3 Ova development in oviparous animals
· 1.4 Ovoviviparity

· 2 Plants
· 3 Other organisms
· 4 History
· 5 See also
· 6 References
· 7 External links

*Animals[edit]*

In animals, egg cells are also known as ova (singular *ovum*, from the
Latin word /ovum/ meaning egg or egg cell). The term *ovule* is used for
the young ovum of an animal. In higher animals, ova are produced by female
gonads (sexual glands) called ovaries and all of them are present at birth
in mammals and mature via oogenesis.

-Human and mammal ova[edit]-

Diagram of a human egg cell
Ovum and sperm fusing together
The process of fertilizing an ovum (Top to bottom)

In viviparous animals (which include humans and all other placental
mammals), the ovum is fertilized inside the female body.

The human ova grow from primitive germ cells that are embedded in the
substance of the ovaries. Each of them divides repeatedly to give
secretions of the uterine glands, ultimately forming a blastocyst.^[1]

The ovum is one of the largest cells in the human body


Source: en.wikipedia.org/wiki/Egg_cell

© 2005-2018 HaveYourSay.org