The role of the mesonephros in the development of the sheep fetal ovary

Zamboni, Luciano; Bézard, J.; Mauléon, P.

doi:10.1051/rnd:19790801

Cited by 86 publications

(59 citation statements)

References 21 publications

(15 reference statements)

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“…3) (Fig. 4) (Zamboni et al, 1979;Byskov, 1986 (Tassel et al, 1983;Sonjaya and Driancourt, 1987;Braw-Tal and Gootwine, 1989 Mauleon (1961Mauleon ( , 1969. The pattern of oogénesis conforms to that reported in rats (Beaumont and Mandi, 1962), humans (Baker, 1963), guinea-pigs (Ioannou, 1964), rhesus monkeys (Baker, 1966), mice (Burgoyne and Baker, 1985) and buffaloes (El-Ghannam and El-Naggar, 1974 (Rabinovici and Jaffe, 1990).…”

Section: Introductionmentioning

confidence: 99%

Effects of the Booroola gene (FecB) on body weight, ovarian development and hormone concentrations during fetal life

Smith¹,

O²,

Hudson³

et al. 1993

Reproduction

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Section: Introductionmentioning

confidence: 99%

Effects of the Booroola gene (FecB) on body weight, ovarian development and hormone concentrations during fetal life

Smith¹,

O²,

Hudson³

et al. 1993

Reproduction

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“…The purpose of this study was to investigate the changing architecture and different cellular associations of the ovarian tissues during postpartum days one through three (pl-p3). Particular attention was devoted to the rete, since it has been hypothesized that the rete is one of the sources for the follicular cells (Byskov and Moore, 1973;Byskov, 1975;Byskov et al, 1977;Costa Gudes and Miraglia, 1977;Stein and Anderson, 1979;Zamboni, 1979).…”

Section: Introductionmentioning

confidence: 99%

The changing architecture of the neonatal rat ovary during histogenesis

Rajah¹,

Glaser²,

Hirshfield³

1992

Developmental Dynamics

142

123

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The purpose of this study was to describe the changing histological organization of the rat ovary during postpartum days one through three (pl-p3). A PC-based image-combining microscope system was used to reconstruct the ovary in three dimensions. On pl, cylindrical pocket-like structures radiated from the core of the ovary that were open toward the surface epithelium. The walls of the pockets contained connective tissue cells and capillaries (stroma). By p2, these pockets had completely closed; each pocket enclosed a small nest of oocytes and a few presumptive granulosa cells. By p3, the pocket-like organization had disappeared. On pl, only one or two primordial follicle-like structures were observed in the core and toward the periphery of the ovary; most oocytes were not enclosed in follicles. By p3, very few naked oocytes remained; primordial follicles predominated in all the regions of the ovary and some of the follicles had multiple layers of granulosa cells. There were changes in location, area, and volume of the rete tubules during these postnatal days. The extraovarian rete was visible on all 3 days but changed its orientation relative to the ovary. The connecting rete was found beneath the epithelial layer of the ovary on all 3 days and showed dramatic increase in area on p2. The wide lumen of the intraovarian rete was in direct contact with some of the oocytes near by on all 3 days, but these "communication points" were most abundant on p2. Based on our observations of different cell-cell associations during this time period, we hypothesize (1) that the mesenchymalpresumptive granulosa cell association is essential for the completion of folliculogenesis, and (2) the rete ovarii may have an inductive role in follicle assembly. These observations suggest that the first 3 days postpartum are critically important for studying the heterogeneous cell interactions that lead to the assembly of primordial follicles. The regional differences in tissue organization during this formative period may have significant implications on later aspects of follicular development. o 1992 Wiley-Liss, Inc.

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“…While the source of the pre-granulosa cells could not be determined accurately in the present samples, the pattern of staining for activity of 3b-HSD in the fetal ovaries would seem to support a mesonephric origin, as described by Zamboni et al (1979), rather than an epithelial origin, as described by . Quirke et al (2001) observed that mesonephric and mesothelial cells of the presumptive medulla in the fetal sheep ovary stain positively for 3b-HSD while those of the presumptive cortex do not.…”

Section: Morphology Of the Gonadal Ridge And The Developing Ovarymentioning

confidence: 65%

“…From the hilum, fibroblasts branched out in tree-like fashion ( Fig. 3d) in 'cell streams' as described by Zamboni et al (1979) to invade all parts of the ovary and right up to the OSE in places. In the 25 mm sections, these cell streams were commonly observed to be associated with darker staining endothelial cells forming blood vessels.…”

Section: Milestones In Fetal Developmentmentioning

confidence: 99%

“…Pre-granulosa cells are distinguishable histologically from other mesenchymal cells by their direct physical contact with at least one oogonium . The embryonic origin of these cells is unclear, likely candidate precursor cells being those of the rete ovarii (Byskov & Lintern-Moore 1973, Zamboni et al 1979 or the surface epithelium . It is also possible that granulosa cells may derive in separate waves from both these populations (Eppig & Handel 2012, Mork et al 2012.…”

Section: Morphology Of the Gonadal Ridge And The Developing Ovarymentioning

confidence: 99%

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Development of the germinal ridge and ovary in the African elephant (Loxodonta africana)

et al. 2012

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The follicular reserve and its ontogeny in the elephant are of interest because elephants have the longest reproductive life of all landbased mammals. They also have the longest recorded pregnancy, which allows a protracted view of the series of significant events involved in the development of the embryonic and fetal gonads. The large elephant population of Zimbabwe provided the opportunity to collect conceptuses from elephants culled for management reasons and hunted professionally. Five embryos aged 76-96 days and the ovaries of four fetuses aged 4.8-11.2 months were fixed in 4% buffered formalin and studied by conventional histological sectioning and a stereological protocol to calculate the follicle reserve of each fetus. These observations enabled the conclusion that the migration of primordial germ cells into the indifferent gonad terminates at around 76 days of gestation while entry of oogonia into meiosis along with first follicle formation starts at around 5 months. Peak numbers of follicles are present by mid-gestation towards the end of the 6-month mitotic-meiotic transition period. It appears that the cortex of the elephant fetal ovary at mid-gestation (11 months) has already reached a developmental stage exhibited by the ovaries of many other mammals at full term.

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The role of the mesonephros in the development of the sheep fetal ovary

Abstract: Introduction.

Cited by 86 publications

References 21 publications

Effects of the Booroola gene (FecB) on body weight, ovarian development and hormone concentrations during fetal life

Effects of the Booroola gene (FecB) on body weight, ovarian development and hormone concentrations during fetal life

The changing architecture of the neonatal rat ovary during histogenesis

Development of the germinal ridge and ovary in the African elephant (Loxodonta africana)

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