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 ?
It seems that reductions in the number of primordial follicles, the number and diameter of secondary and antral follicles and the increase in the number of atretic follicles caused a significant decrease in ovarian weight in different stages of postnatal development.
Alpha atretic follicles (Hunter and Macewicz, 1985b) were identified in biopsy samples taken with a Pipelle de Cornier[R] (Prodimed, Neuilly En Thelle, Picardie, France), a flexible, plastic tube 2.
Therefore, we examined nine ovaries that were recently spent, which contained only healthy stage-4 oocytes and atretic hydrated oocytes that could be easily distinguished (Fig.
In some cases the duration of POF resorption is underestimated because late POFs can be confused with late atretic stages (e.
Atretic oocytes were found in samples throughout the year, except February, in ovaries of various maturity phases.
Furthermore, we observed a rise in the number of atretic follicles and corpora lutea in group B.
Low magnification showed atretic follicles and several hyalinized vessels with markedly enlarged lymphoid follicles with a nodular growth pattern (Figure 12, A).
HE staining and BrdU immunohistochemistry of the ovarian tissues indicated the increased amount of atretic follicles (5.
10) So, when GnRH antagonist is added to suppress LH, the smaller follicles having higher LH threshold get atretic and there are ultimately lesser follicles achieving dominance.
The dose commonly used in mice (6 mg/100 g body weight) provokes infertility and the formation of atretic follicles and follicular cysts in the ovaries (46-48).