Nevertheless all living things have much in common, in their chemical composition, their germinal vesicles
, their cellular structure, and their laws of growth and reproduction.
In the late phase of this stage, yolk granules occurred in germinal vesicle
migration oocytes, which were characterized by a large size and a high number of oocytes (Figs.
In the pre-ovulatory phase, germinal vesicle
migration towards the micropyle was detected in most oocytes.
(A) Female reproductive system of Scyphophorus acupunctatus formed by 2 ovaries (ov), germarium (g), vitellarium (v), oocyte (o), lateral oviduct (lo), common oviduct (co), spermatheca (s), and genital chamber (gc); (B) Distal part of the germarium (g) with bulky appearance possibly with trophocytes, prefollicular cells, and oogonia, terminal filament (tf), trachea (tr), tracheoles (trl); and (C) Approach to the onset of vitellarium with oocytes in development, germinal vesicle
(gv), interfollicular tissue (tif), trachea (tr), and tracheoles (trl).
3, B and D), the majority of germ cells were in the germinal vesicle
breakdown stage and ranged in diameter from 1800 to 2000 pm.
* High dose of co-trimoxazole treatment caused significant structural abnormalities and decreases in ovarian quality, including the number of germinal vesicles
and metaphase I and metaphase II of rat oocytes.
In vitro culture and maturation of Germinal Vesicle
(GV) oocytes is an efficient method to generate mature oocytes.
PI, prophase I; PMI, prometaphase I; MI, metaphase I; MII, metaphase II; Egr3, early growth response protein 3; GV, germinal vesicle
; IBMX, 3-isobutyl-1-methylxanthine.
maximus from the Eastern Gulf of Mexico, Collins and McBride (2015) observed a diel pattern of oocyte maturation in females: germinal vesicle
migration of the vitellogenic oocytes occurs in the late morning-early afternoon preceding spawning day.
(GV), germinal vesicle
breakdown (GVBD), Metaphase I (MI), Anaphase/Telophase I (ATI), and Metaphase II (MII) stages mouse oocytes were collected after being cultured in M16 medium for 0, 4, 8, 9.5, or 14 h, respectively.
The oocyte maturation begins with germinal vesicle
migration (GVM, early hydration), going to germinal vesicle
breakdown (GVBD, middle hydration) and hydrated oocyte stage (HO, final hydration) when it is previous to spawning (Figure 2e-f).
In fact, supplementation with myoinositol in the IVF technique is positively associated to meiotic progression of mouse germinal vesicle
oocytes, enhancing intracellular [Ca2.sup.+] oscillation .