Ultrastructural changes of the stigma of the follicle during the process of ovulation in the hen

No structural changes could be observed in the stigma until 2 h before ovulation. Within a few minutes of ovulation, the stratum granulosum and theca interna disappear completely in the middle part of the stigma. By 30 min before ovulation, the rough endoplasmic reticulum in the fibroblasts of the t...

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Bibliographic Details
Published inCell and tissue research Vol. 224; no. 2; pp. 349 - 359
Main Authors Yoshimura, Y, Koga, O
Format Journal Article
LanguageEnglish
Published Germany 01.01.1982
Subjects
Animals
chickens
Chickens - anatomy & histology
Chickens - physiology
Cytoplasmic Granules - ultrastructure
Endoplasmic Reticulum - ultrastructure
Female
Granulosa Cells - ultrastructure
Lipids - analysis
Microscopy, Electron
Mitochondria - ultrastructure
Ovary - ultrastructure
Ovulation
Ribosomes - ultrastructure
Theca Cells - ultrastructure
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Summary:No structural changes could be observed in the stigma until 2 h before ovulation. Within a few minutes of ovulation, the stratum granulosum and theca interna disappear completely in the middle part of the stigma. By 30 min before ovulation, the rough endoplasmic reticulum in the fibroblasts of the theca externa develops conspicuously. Then a few minutes before ovulation, the theca externa becomes much thinner with a conspicuous disintegration of the collagenous fibers into individual fibrils. These structural changes may contribute to the fragility of the stigma tissue and induce rupture of the follicle.
ISSN:0302-766X
1432-0878
DOI:10.1007/BF00216878