Ovulation: Insights About the Mechanisms Based on a Comparative Approach

Jones, Richard E.

doi:10.1007/978-1-4613-1869-9_8

Cited by 12 publications

(14 citation statements)

References 187 publications

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“…Morphological and physiological results (for review see Schroeder and Talbot, 1985;Jones, 1987) as well as our observations supported the prevailing hypothesis that cells of the theca externa might also have a role in ovulation. Yoshimura et al (1983) showed that the theca externa contracts intermittently in preovulatory follicles, suggesting a vitellodynamic function .…”

Section: Resultssupporting

confidence: 89%

Structural and immunohistochemical aspects of the postovulatory follicle in Japanese quail

Nassauw

Callebaut

1991

Anat. Rec.

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In the present study, we searched for the presence of granulosa lipid spheres, of lacunae, and of the smooth-muscle markers desmin and alpha-smooth-muscle actin, in the wall of the POF1 of the quail ovary. Lacunae, using the labelled yolk technique, were visible as large cavities in the POF1 wall. The immunohistochemical localization of desmin was similar to that observed in preovulatory follicles. A similar distribution was observed using an anti-alpha-smooth-muscle actin antiserum, but the cells of the theca externa were also positively stained. The general conclusion was that the studied structures were similarly localized in the follicle wall, before and during the day after ovulation, but that they are more obvious in the POF, due to its general contracted state.

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Section: Resultssupporting

confidence: 89%

Structural and immunohistochemical aspects of the postovulatory follicle in Japanese quail

Nassauw

Callebaut

1991

Anat. Rec.

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“…In most vertebrates, a marked surge of plasma LH and/or FSH stimulates follicular rupture and also initiates subsequent luteinization of the granulosa cells (Jones, 1987). In reptiles, the precise roles of the GTHs in ovulation remain unclear.…”

Section: Hormonal Control Of Ovulationmentioning

confidence: 99%

Hormonal Regulation of Ovarian Function in Reptiles

Jones

2011

Hormones and Reproduction of Vertebrates

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“…In mammals, contractile activity of the follicular wall is caused by the smooth muscle cells of the theca externa [1][2][3][4]. Important contributions to the role of thecal smooth muscle cells in the ovulatory process have been made by studies in the hamster [4].…”

Section: Discussionmentioning

confidence: 99%

“…In vitro contractile experiments have been carried out in various vertebrate species, mainly in eutherian mammals [1][2][3][4]. Most of these experiments have been used to investigate the effects of different metabolic and pharmacological compounds on the contractility of the follicular wall.…”

Section: Discussionmentioning

confidence: 99%

“…The muscular apparatus of the ovary, mainly of the preovulatory follicle, has been investigated more thoroughly in eutherian mammals than in any other group of vertebrates [1][2][3][4]. Possible functions of the contractile apparatus of mammalian ovarian follicles include aid in follicular rupture [5], collapse of the follicular wall and corpus luteum formation [6], and compaction of the follicle during atresia [7].…”

Section: Introductionmentioning

confidence: 99%

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In Vitro Study of the Contractility of the Wall of the Preovulatory Follicle in the Japanese Quail1

Nassauw

Sys

Harrisson

et al. 1993

Biology of Reproduction

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In the present study, we examined in vitro the potassium-induced contractions of isolated parts of the wall of the quail preovulatory follicle through use of an electromagnetic force-length transducer system. We studied longitudinal and transverse strips of the whole wall, of the theca, and of the outer layer (tunica albuginea and surface epithelium). It was observed that force development and shortening of strips of the whole wall and those of the theca are similar. Statistical analysis of maximal isometric force, peak shortening length, and percentage of reduction of follicular volume showed that the orientation of strips is without importance. Results from different orientations were pooled, and the different layers were compared statistically. The general result of this analysis was that the contractile activity of the outer layer was significantly lower than the performance of either the whole wall or the theca. We concluded that contraction of the follicular wall is mainly dependent on the contractile activity of the theca externa. This contractile system is comparable to that of mammals. We suggest that the main function of the theca externa during ovulation is to maintain a constant intrafollicular pressure.

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Ovulation: Insights About the Mechanisms Based on a Comparative Approach

Cited by 12 publications

References 187 publications

Structural and immunohistochemical aspects of the postovulatory follicle in Japanese quail

Structural and immunohistochemical aspects of the postovulatory follicle in Japanese quail

Hormonal Regulation of Ovarian Function in Reptiles

In Vitro Study of the Contractility of the Wall of the Preovulatory Follicle in the Japanese Quail1

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