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A human ovum
A human ovum

An ovum (loosely, egg or egg cell) is a female sex cell or gamete. Both animals and seed plants have ova. The term ovule is used for the ovum of seed plants and for the young ovum of an animal. The word is derived from the Latin word ovum (plural ova) for egg. File links The following pages link to this file: Ovum Wikipedia:Grays Anatomy images with missing articles 1 Categories: Public domain images ... File links The following pages link to this file: Ovum Wikipedia:Grays Anatomy images with missing articles 1 Categories: Public domain images ... Female symbol Female is the sex of an organism, or a part of an organism, which produces egg cells. ... Gametes (in Greek: γαμέτες) —also known as sex cells, germ cells, or spores—are the specialized cells that come together during fertilization (conception) in organisms that reproduce sexually. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Subregnum Bilateria  Acoelomorpha  Orthonectida  Rhombozoa  Myxozoa  Superphylum Deuterostomia     Chordata (vertebrates, etc. ... The spermatophytes comprise those plants that produce seeds. ... Latin is the language originally spoken in the region around Rome called Latium. ... Look up Egg in Wiktionary, the free dictionary Egg has multiple meanings: The term is used synonymously with ovum, the female sex cell in animals and plants. ...


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. In the oviparous animals (all birds, most fishes, amphibians and reptiles) the ova develop protective layers and pass through the oviduct to the outside of the body. They are fertilized by male sperm either inside the female body (as in birds), or outside (as in many fishes). After fertilization, an embryo develops, nourished by nutrients contained in the egg. It then hatches from the egg, outside the mother's body. See egg (biology) for a discussion of eggs of oviparous animals. The gonad is the organ that makes gametes. ... Human female internal reproductive anatomy Ovaries are a part of a female organism that produces eggs. ... Orders Subclass Monotremata Monotremata Subclass Marsupialia Didelphimorphia Paucituberculata Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Subclass Placentalia Xenarthra Dermoptera Desmostylia Scandentia Primates Rodentia Lagomorpha Insectivora Chiroptera Pholidota Carnivora Perissodactyla Artiodactyla Cetacea Afrosoricida Macroscelidea Tubulidentata Hyracoidea Proboscidea Sirenia The mammals are the class of vertebrate animals characterized by the presence of mammary glands... Oogenesis refers to the process of formation, development, and maturation of a healthy oocyte (egg) in the ovary. ... Orders Many - see section below. ... Groups Conodonta Hyperoartia Petromyzontidae (lampreys) Pteraspidomorphi (early jawless fish) Thelodonti Anaspida Cephalaspidomorphi (early jawless fish) Galeaspida Pituriaspida Osteostraci Gnathostomata (jawed vertebrates) Placodermi Chondrichthyes (cartilaginous fish) Acanthodii Osteichthyes (bony fish) Actinopterygii (ray-finned fish) Sarcopterygii (lobe-finned fish) Actinistia (coelacanths) Dipnoi (lungfish) A fish is a poikilothermic (cold-blooded)* water-dwelling... For other uses, see Amphibian (disambiguation). ... It has been suggested that Prehistoric reptile be merged into this article or section. ... In oviparous animals (those that lay eggs), the passage from the ovaries to the outside of the body is known as the oviduct. ... Categories: Biology stubs ... Schematic diagram of a sperm cell, showing the (1) acrosome, (2) cell membrane, (3) nucleus, (4) mitochondria, and (5) flagellum (tail) A sperm cell, or spermatozoon ( spermatozoa) (in Greek: sperm = semen and zoon = alive), is the haploid cell that is the male gamete. ... Embryos (and one tadpole) of the wrinkled frog (Rana rugosa you beezie). ... An average Whooping Crane egg is 102 mm long, and weighs 208 grams A baby tortoise emerges from a reptile egg. ...


The egg cell's cytoplasm and mitochondria (and chloroplasts in plants) are the sole means of the egg being able to reproduce by mitosis and eventually form a blastocyst after fertilisation, and the sperm are often too small to contribute anything physical except DNA and its own mitochondria gets destroyed by the egg. The egg is thus the sole provider of such endosymbiotic organelles, including mitochondria and chloroplasts within the cytoplasm, especially since these cannot be produced with nuclear DNA alone and must be manufactured from DNA within existing organelles of their type (such as mitochondrial DNA) - this is important in mitochondrial genetics and can be used to trace maternal and paternal ancestry, especially as plants contain chloroplasts as well. The cytoplasm is a jelly-like material, made up of mostly water, that fills the cell. ... In cell biology, a mitochondrion is an organelle found in the cells of most eukaryotes. ... The inside of a chloroplast Chloroplasts are organelles found in plant cells and eukaryotic algae which conduct photosynthesis. ... Light micrograph of a newt lung cell in early anaphase of mitosis. ... Embryogenesis is the process of cell division and cellular differentiation which leads to the development of an embryo. ... An endosymbiont (also known as intracellular symbiont) is any organism that lives within cells of another organism, i. ... In cell biology, an organelle is one of several structures with specialized functions, suspended in the cytoplasm of a eukaryotic cell. ... Mitochondrial DNA (mtDNA, or less popularly, mDNA) is DNA which is not located in the nucleus of the cell but in the mitochondria. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Kinship and descent is one of the major concepts of cultural anthropology. ...

A sperm attempting to fertilize an ovum
A sperm attempting to fertilize an ovum

In the viviparous animals (which include humans and all other placental mammals), the ovum is fertilized inside the female body, and the embryo then develops inside the uterus until it is born. It receives nutrition directly from the mother. The ovum is the largest cell in the human body, typically visible to the naked eye without the aid of a microscope or other magnification device. A sperm attempts to penetrate the ovum coat to fertilize it. ... A sperm attempts to penetrate the ovum coat to fertilize it. ... A viviparous animal is an animal employing vivipary, a method of reproduction in which the embryo develops inside the body of the mother from which it gains nourishment, and not from an egg. ... Binomial name Homo sapiens Linnaeus, 1758 Subspecies Homo sapiens idaltu (extinct) Homo sapiens sapiens Human beings define themselves in biological, social, and spiritual terms. ... Orders Subclass Monotremata Monotremata Subclass Marsupialia Didelphimorphia Paucituberculata Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Subclass Placentalia Xenarthra Dermoptera Desmostylia Scandentia Primates Rodentia Lagomorpha Insectivora Chiroptera Pholidota Carnivora Perissodactyla Artiodactyla Cetacea Afrosoricida Macroscelidea Tubulidentata Hyracoidea Proboscidea Sirenia The mammals are the class of vertebrate animals characterized by the presence of mammary glands... Female internal reproductive anatomy The uterus or womb is the major female reproductive organ of most mammals, including humans. ... Cells in culture, stained for keratin The cell is the structural and functional unit of all living organisms. ... 1852 microscope Compound microscope made by John Cuff in 1750 A microscope (Greek: micron = small and scopos = aim) is an instrument for viewing objects that are too small to be seen by the naked or unaided eye. ...


There is an intermediate form, the ovoviviparous animals: the embryo develops within and is nourished by an egg as in the oviparous case, but then it hatches inside the mother's body shortly before birth, or just after the egg leaves the mother's body. Some fish, reptiles and many invertebrates use this technique. Ovoviviparous animals develop within eggs that remain within the mother up until they hatch or are about to. ... Invertebrate is a term coined by Jean-Baptiste Lamarck to describe any animal without a spinal column. ...


See also

An average Whooping Crane egg is 102 mm long, and weighs 208 grams A baby tortoise emerges from a reptile egg. ... A sperm attempting to fertilize an egg Fertilisation (also known as fertilization and syngamy) is fusion of gametes to form a new organism. ... Insemination is the introduction of semen into the genital tract of a female. ... The phrase menstrual cycle ( or period) refers to the recurring physiological changes in a females body that are under the control of the reproductive hormone system and necessary for reproduction. ... Ovulation is the process of discharging a mature ovum (egg) from an ovary after a Graafian follicle - representing the final stage of follicular development before ovulation - has been formed. ... Pollination is an important step in the reproduction of seed plants: the transfer of pollen grains (male gametes) to the plant carpel, the structure that contains the ovule (female gamete). ... This article needs to be cleaned up to conform to a higher standard of quality. ... Respiratory burst is the release of reactive oxygen species (superoxide radical and hydrogen peroxide) from different types of cells. ... Schematic diagram of a sperm cell, showing the (1) acrosome, (2) cell membrane, (3) nucleus, (4) mitochondria, and (5) flagellum (tail) A sperm cell, or spermatozoon ( spermatozoa) (in Greek: sperm = semen and zoon = alive), is the haploid cell that is the male gamete. ... A zygote (Greek: ζυγωτόν) is a cell that is the result of fertilization. ...

External links

  • The Ovarian Kaleidoscope Database description of 1800 genes involved in ovarian functions

  Results from FactBites:
 
The Ova Prima Foundation (335 words)
Since 1887, the Ova Prima Foundation has existed for the sole purpose of exploring the mystery and the beauty that is the egg.
The Ova Prima faculty is highly respected and includes scholars and scientists in the fields of paleontology, oogenetics, archaeology, and ovaprimatology.
The Ova Prima Museum of Natural History and the Shippen Library are open to the public.
Original Video Animation - Wikipedia, the free encyclopedia (450 words)
Original Video Animation (OVA) is an acronym used in Japan for anime that are released directly to video, without being first broadcast on TV or released in theaters.
As a general rule, OVA animation tends to be of high quality, approaching that of movies.
Probably the longest OVA series ever made is Legend of the Galactic Heroes, which spanned 110 main episodes, and 52 gaiden episodes as well as several movies.
  More results at FactBites »

 
 

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