Oogonium

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Related to oogonia: oogenesis, polar body, primordial follicle

oogonium

[‚ō·ə′gō·nē·əm]
(botany)
The unisexual female sex organ in oogamous algae and fungi.
(histology)
A descendant of a primary germ cell which develops into an oocyte.

Oogonium

 

the female sex organ (gametangium) of many lower plants that are characterized by oogamy. A single egg cell develops in the oogonium. Several egg cells rarely develop, for example, in Cyclosporeae brown algae. The oogonium is usually unicellular; less frequently, is it multicellular, for example, in Charophyta algae.

References in periodicals archive ?
After 12-16 wk, the gonads begin to differentiate, and both oogonia and spermatagonia are present.
spermatogonia and Only oogonia and primary primary spermatocytes are growth oocytes are present.
For ovaries, we counted oogonia and oocytes in sections stained with hematoxylin and eosin.
In some individuals, ovaries contained only oogonia, but in other females at a more advanced stage of development and with larger ovaries, both oogonia and primary oocytes in the perinucleolar stage were present.
4B), gonadal tubules constitute groups of oogonia in division that are still attached to the gonadal tubule wall (oocyte diameter, < 15 [micro]m).
Phase Subphase Description Immature Only oogonia and primary oocytes present.
In all cases of testis-ova, oogonia were present throughout the testicular tissue (Figure 3).
At 10[degrees]C, female germinal follicles contained primarily vitellogenic oocytes, with the majority still oogonia or young oocytes.
Key criteria included the presence of oogonia and primitive testicular tissue in the gonads of bisexual juveniles, the presence of brown body atretic structures in testes of mature sex-changed males as evidence of prior female function, and the occurrence of transitional individuals whose gonads contained both developing male and regressing female tissue types (Sadovy de Mitcheson and Liu, 2008).
Oogonia and stage 1 oocytes were seen in the gonad cavity of an 18-too-old female, whereas in the gonad of 2-y-old females, all stages of oogenesis could be distinguished, although mature oocytes were not abundant.
1992) but excludes precursor cells such as previtellogenic follicles (PVFs) or oogonia.