atresia

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atresia

[ə′trē·zhə]
(medicine)
Imperforation or closure of a natural orifice or passage of the body.
References in periodicals archive ?
Atretic or spent No spermatogenesis occurring but some residual spermatozoa in shrunken lobules and ducts.
The occurrence of atretic oocytes was highest in May and became lower as the season progressed until the end of the spawning season.
II Resting Relatively thick ovarian wall; spaces be- tween lamellae common; only previtellogenic oocyte stages and possibly brown bodies and few atretic vitellogenic oocytes present.
Thus, according to study results, it can be concluded that waves emitted from mobile phones may reduce the number of secondary and Grapian follicles by interfere in controlling routines and also increase the atretic follicles that can have adverse effect on fertility of female rats.
We also determined the number of corpora lutea, antral follicles, atretic follicles, and preovulatory follicles in each group.
During the early stages of sexual transition, chromatin nucleolar oocytes, perinucleolar oocytes, and atretic follicles were observed within the tissue (Figure 3A), along with developing spermatocysts that became more common in mid-transitional fish (Figure 3B).
Moreover, the V1 and V2 segments of the bilateral vertebral arteries were atretic.
As special attention is paid to atretic follicle formation pathways, this study also undertaken to develop a new approach in characterizing atrectic follicles with a focus on granulosa cell dissociation (GCD), early antrum formation, and GC luteinization and floatation in the antrum which resemble macrophages.
Four stages of oogenesis were characterized: previtellogenesis (oogonia, Po0; early previtellogenic oocyte, Pol; late previtellogenic oocyte, Po2), vitellogenesis (early vitellogenic oocyte, Vol; late vitellogenic oocyte, Vo2), postvitellogenesis (postvitellogenic oocyte, Pvo), and 2 structural indicators of spawning (postovulatory follicles (FP) and atretic follicles (FA)) (Fig.