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(vī'tel-ō-jen'ĕ-sis, vī'tĕ-lō-),
Formation of the yolk and its accumulation in the yolk sac.
[L. vitellus, yolk, + G. genesis, production]
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(vīt′l-ō-jĕn′ĭ-sĭs, vĭt′-)
Formation of the yolk of an egg.

vi′tel·lo·ge·net′ic (-jə-nĕt′ĭk), vi′tel·lo·gen′ic (-jĕn′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in periodicals archive ?
Histological analysis revealed significant differences (p<0.001) among treatments in oocyte size and the proportion of previtellogenic and vitellogenic oocytes (See Table 2).
During the secondary vitellogenesis stage, the histological sections showed a prominence (80%) of secondary vitellogenic stage oocytes (late vitellin globule oocytes), which occupied a considerable portion of the ovary; a few previtellogenic oocytes (chromatin nucleolus, early chromatin perinucleolus and late chromatin perinucleolus) were found (20%) interspersed among the vitellogenic oocytes.
Cumaranatunga (1985) and Tyler and Sumpter (1996), observed increased number of atresia in group-synchronous Rainbow trout ovaries at vitellogenic stage.
In this regard, recent reports indicate that apple snails and probably other gastropods have evolved an alternative vitellogenic mechanism whereby perivitellins, unlike vitelline of other invertebrates, are synthesized as already functional in the albumen gland (Cadierno et al., 2017).
In the ovaries of these females, vitellogenic oocytes (diameter varied from 525 to 960 [micro]m) had developed simultaneously (Fig.
Histologically, mature ovaries of the analyzed fishes were filled with vitellogenic oocytes with diameters varying between 586.7 [+ or -] 26.5 and 616.6 [+ or -] 59.4 [micro]m (Fig.
The first one was composed of not vitellogenic oocytes (2B stage = 70.0%; 2C stage = 54.9%).
Estradiol alongwith other ovarian steroids, is an important regulator of vitellogenic growth of the devleoping oocytes [26].
For means of measurement, only oocytes from mature (MA) females (i.e., females with pre-vitellogenic follicles which are selected for maturation), oocytes from ripening (MR) females (i.e., those with vitellogenic follicles), and oocytes and eggs from ripe (RE) females (i.e., those undergoing oviposition) were used.