The Relation Between the Rate of Growth of the Ovarian Follicles and the Shape of the Frequency Curve Representing Their Variability in Size

Paesi, F. J. A.

doi:10.1530/acta.0.0030173

Cited by 7 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen that follicles spend about 14 days in the ovary as medium-sized follicles, developing from early Type 3b to Type 5a, but that they grow through the stages of Types 5b and 6 in less than 2 days, and can even start on the degenerative process within this time interval. Paesi (1949) found almost the same relationship between the growth rates of follicles by determining the frequency curve of follicles of different sizes.…”

Section: Discussionmentioning

confidence: 59%

Determination of Follicle Growth Rate in the Ovary of the Immature Mouse

Pedersen¹

1970

Reproduction

View full text Add to dashboard Cite

The cell population kinetics of the ovary in 28-day-old mice were investigated. A method to determine growth rates of follicles is described, and the results obtained are discussed.The granulosa cells in each follicle were considered to represent a single cell population. The time taken to double such a cell population was calculated from the labelling index of the granulosa cells and the duration of the synthesis phase of the single cells. Both parameters have been determined in autoradiographs prepared at different time intervals after the injection of tritiated thymidine. Different stages of follicle development were classified according to the number of their granulosa cells. The actual time taken to grow to different stages was calculated from the time taken to double the number of the granulosa cells in these stages. It was shown that medium follicles grow at a slower rate than large follicles. A small follicle with one layer of granulosa cells took 16 days to develop into a large one with several layers and antrum formation.

show abstract

Section: Discussionmentioning

confidence: 59%

Determination of Follicle Growth Rate in the Ovary of the Immature Mouse

Pedersen¹

1970

Reproduction

View full text Add to dashboard Cite

show abstract

“…The classification of the follicles during folliculogenesis is an important step and should be widely standardized in order to compare different species and a prerequisite to use the primordial pool to enhance reproductive efficiency in domestic animals, humans and endangered species (Fortune, ). There are different proposals to categorize the follicles during folliculogenesis, generally considering the number of cells in the granulosa layers (Pedersen & Peters, ), the diameter of the follicles (Boling, Blandau, Soderwall, & Young, ; Paesi, ), the number of granulosa layers (Hadek, ; Myers, Britt, Wreford, Ebling, & Kerr, ; Palma‐Cerda, Di Fiore, Sepúlveda, Duran, & Raucci, ), presence/absence of antrum cavity (Myers et al., ; Pedersen & Peters, ) and the size of the oocytes (Pedersen & Peters, ). According to the classification by Williams & Erickson (), which takes into account three factors, the number of layers of granulosa cells, the development of theca tissue and the expression of a small cavity or antrum, we stated that A. planirostris and E .…”

Section: Discussionmentioning

confidence: 99%

Ovarian morphology and folliculogenesis and ovulation process in the flat‐faced fruit‐eating bat Artibeus planirostris and the Argentine brown bat Eptesicus furinalis: A comparative analysis

et al. 2018

View full text Add to dashboard Cite

The Neotropical bat species Artibeus planirostris and Eptesicus furinalis present a different morphology of the female reproductive organs: the first presents a simplex uterus, while the second presents a bicornuate uterus, but there is no information about their ovaries. Our aim was to compare the general ovary morphology and the folliculogenesis process in these species to increase the knowledge about the reproductive diversity of tropical bats. We observed a morphological distinction between the ovaries of both species: A. planirostris presents the primordial follicles located in a cranial portion of the ovary and the interstitial gland cells are not distinctive, while in E. furinalis, the primordial follicles are located throughout the cortex, and there is an abundance of interstitial gland cells. Both species present binovular or triovular follicles. Artibeus planirostris is a monovular species, with a preferential ovulation in the left side. Some females of E. furinalis exhibited two corpora lutea in the same ovary, and others presented a corpus luteum in both right and left ovaries at the same time; thus, E. furinalis is a polyovular species. Our results express the variation between two Neotropical species, reflecting the great variation in the reproductive aspects in Chiroptera.

show abstract

“…Hence 2 mm, the size at which the amount of FSH receptors on the granulosa cells and of LH receptors on the thecal layer is maximum (Carson et al, 1979) and at which aromatase activity starts to increase (Tsonis et al, 1984a), is a key stage in folliculogenesis, separating a basal follicular growth, at least partly gonadotrophin-independent, from a tonic follicular growth acutely depen¬ dent on gonadotrophins. Extrapolation of these concepts of basal and tonic folliculogenesis to rats from the data on follicular populations in hypophysectomized animals (Paesi, 1949;Ingram, 1953) suggests that the size limit between basal and tonic follicular growth coincides with the large pre¬ antral stage in rats. In rats and sheep, recruitment of follicles for terminal follicular growth involves only follicles exceeding this size (Hirshfield & Midgley, 1978a,b;Driancourt & Cahill, 1984;Tsonis et al, 1984b).…”

Section: Discussionmentioning

confidence: 99%

Follicular growth and regression during the 8 days after hypophysectomy in sheep

Driancourt¹,

Fry²,

Clarke³

et al. 1987

Reproduction

View full text Add to dashboard Cite

Ewes were hypophysectomized on Day 0 and ovariectomized 1, 2, 4 or 8 days later. There was no effect of hypophysectomy on the overall population of follicles greater than 0.8 mm in diameter during the time studied. However, the growth of healthy follicles greater than 2 mm in diameter was prevented by Day 2. Turnover of follicles was very active in the ovaries of hypophysectomized ewes as shown by peaks in the proportion of follicles in early atresia at Day 4 and in advanced atresia at Days 1 and 8. By Day 8, most of the measures of the population of follicles 0.8 to 2 mm in diameter were back to the values of Day 0 ewes. The mitotic index of the granulosa cells of the healthy follicles exhibited a similar pattern with a nadir at Day 2 followed by a return at Days 4 and 8 to values similar to Day 0 ewes. Ink-marked preovulatory follicles underwent a steady decrease in their histological size after hypophysectomy and this was associated with time-related changes in the health status of these follicles. By Day 1, 4 out of 7 follicles were still healthy while at Days 2, 4 and 8, all follicles were in advanced, late and collapsing atresia respectively. There was no evidence of an ability of PMSG (1000 i.u.) to rescue large follicles in advanced atresia (48 h after hypophysectomy). Furthermore, at 24 h after hypophysectomy, only 2 out of 5 follicles were maintained.(ABSTRACT TRUNCATED AT 250 WORDS)

show abstract

The Relation Between the Rate of Growth of the Ovarian Follicles and the Shape of the Frequency Curve Representing Their Variability in Size

Cited by 7 publications

References 0 publications

Determination of Follicle Growth Rate in the Ovary of the Immature Mouse

Determination of Follicle Growth Rate in the Ovary of the Immature Mouse

Ovarian morphology and folliculogenesis and ovulation process in the flat‐faced fruit‐eating bat Artibeus planirostris and the Argentine brown bat Eptesicus furinalis: A comparative analysis

Follicular growth and regression during the 8 days after hypophysectomy in sheep

Contact Info

Product

Resources

About