oogonium

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oogonium

 [o″o-go´ne-um]
[Gr.], a primordial oocyte during fetal development; near the time of birth it becomes a primary oocyte.

o·o·go·ni·um

, pl.

o·o·go·ni·a

(ō'ō-gō'nē-ŭm, -ă),
1. Primordial germ cells; proliferate by mitotic division. All oogonia develop into primary oocytes before birth occurs; no oogonia are present after birth.
2. In fungi, the female gametangium bearing one or more oospores.
[G. ōon, egg, + gonē, generation]

oogonium

/oo·go·ni·um/ (-go´ne-um) pl. oogo´nia   [Gr.]
1. a primordial oocyte during fetal development; it is derived from a primordial germ cell and before birth becomes a primary oocyte.
2. the female reproductive structure in certain fungi and algae.

oogonium

(ō′ə-gō′nē-əm)
n. pl. oogo·nia (-nē-ə) or oogo·niums
1. Any of the cells that give rise through mitosis to the oocytes and are found in the ovaries of vertebrates.
2. A female reproductive structure in certain thallophytes and in oomycetes, usually a rounded cell or sac containing one or more oospheres.

o′o·go′ni·al (-nē-əl) adj.

oogonium

[ō′əgō′nē·əm] pl. oogonia
Etymology: Gk, oon + gonos, offspring
the precursor cell from which an oocyte develops in the fetus during intrauterine life. Also called ovogonium. See also oogenesis.

o·o·go·ni·um

, pl. oogonia (ō'ŏ-gō'nē-ŭm, -nē-ă)
1. Primordial germ cells; proliferate by mitotic division.
2. In fungi, the female gametangium bearing one or more oospores.
[G. ōon, egg, + gonē, generation]

oogonium

  1. an early DIPLOID (1) stage in GAMETOGENESIS of female animals giving rise to the OOCYTES.
  2. (in algae and fungi) the female sex organ containing the OOSPHERES.

oogonium

pl. oogonia [Gr.] an ovarian egg during fetal development; near the time of birth it becomes a primary oocyte.
References in periodicals archive ?
However, the presence of the tissue stalk, in addition to the rounded oogonial nests throughout the gonad, strongly indicated that the specimen was female.
The oogenesis of the two Corbicula species occurred in the oogenic or hermaphroditic follicles between the digestive and the outer fibromuscular layers and was divided into five stages: oogonial, previtellogenic oocyte, vitellogenic oocyte, and mature oocyte stages.
Gonadal maturity determined from microscopic staging of histological ovary preparations indicated maturation stages ranging from oogonial to fully vitellogenic (Table 2; Minagawa and Sano, 1997) for the females of each species.