Anderson, "The controversial existence and functional potential of oogonial
stem cells," Maturitas, vol.
In the germinal epithelium that lined the ovarian tubules, oogonial
proliferation formed clusters of germ cells (nests) that projected into the ovarian lumen (Fig.
In the inter phasic nuclei of female specimens, only one strongly stained nucleolus was observed, confirming the number of active NORs verified in the oogonial
Based on ultrastructural observations, the germ cell developmental phases during oogenesis can be classified into 4 phases: (1) oogonial
phase; (2) previtellogenic phase; (3) vitellogenic phase and (4) mature phase.
For females, only oogonial
prometaphases were studied because no meiotic stages can be detected.
El periodo de mitosis oogonial
, ocurre entre los dias 45 a 110 de gestacion y es el periodo de mayor oogenesis.
The germ-cell nests, which eventually gave rise to oogonial
nests, were first found along the lateral periphery of the lobe and were infrequently scattered within the gonad lobe.
5h, arrow); RVPOs (187-200 [micro]m), and smaller new vitellogenic primary oocytes (NVPOs) (<100 [micro]m), the latter resulting from recent oogonial
Concerning the first question, Pepling & Spradling (1998) have verified a tendency towards the increase in number by the power of two in mouse embryo oogonial
mitotic cells, being more frequently found in clusters of two cells.