Entwicklung der Genitalorgane und Bildung der Gameten

Wartenberg, H.; Breucker, Haide; Holstein, A. F.; Dvořák, Milan

doi:10.1007/978-3-662-07815-0_28

Cited by 14 publications

(22 citation statements)

References 63 publications

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“…The anlage of the inguinal band becomes apparent in stage 18 (13 17 mm CRL) and later according to the literature (Wieger 1885;Felix 1911 ;Clara 1949;von Hayek 1969;Wartenberg 1990). This is slightly later than our observations indicate.…”

Section: Discussionmentioning

confidence: 79%

“…The gubernaculum (Hunteri) is described in recent textbooks (von Hayek 1969;Hamilton et al 1972;Starck 1975;Moore 1980;Wartenberg 1990) as a uniform strand of mesenchymal tissue arising simultaneously from the caudal end of the mesonephros and of the gonad, leading through the abdominal wall and radiating into the genital swelling. During its course it passes below the mesonephric (Wolffian) and paramesonephric (Miillerian) duct intersection (von Hayek 1969;Hamilton et al 1972;Starck 1975;Moore 1980;Wartenberg 1990).…”

Section: Introductionmentioning

confidence: 99%

“…During its course it passes below the mesonephric (Wolffian) and paramesonephric (Miillerian) duct intersection (von Hayek 1969;Hamilton et al 1972;Starck 1975;Moore 1980;Wartenberg 1990). …”

Section: Introductionmentioning

confidence: 99%

“…However, the appearance of the mesenchymal anlage at the caudal mesonephric pole is not dated exactly by any of the authors mentioned above. There is only a reference stating the presence of the anlage in embryos of 20 mm CRL (stage 20, O'Rahilly et al 1981) and older (Wieger 1885;Felix 1911;Clara 1949;Wartenberg 1990). Tl)e gubernaculum in its wider sense is considered by Felix (1911) to arise by the fusion of the caudal gonadal ligament (the prospective ligamentum scrotale testis sire ovarii propriurn) with the inguinal ligament of the mesonephros.This view led to the current opinion that the gubernaculum consists of a uniform strand connecting the caudal pole of the gonad with the inguinal region.…”

Section: Introductionmentioning

confidence: 99%

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The development of the caudal ligaments of the mesonephros and of the gonads: a contribution to the development of the human gubernaculum (Hunteri)

Ludwig

1993

Anat Embryol

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The formation of the two caudal mesonephric folds is described. The plica uropelvina becomes the plica urogenitalis as soon as the paramesonephric (Müllerian) duct grows, and the plica inguinalis runs over the ridge of the umbilical artery to the ventral abdominal wall. Within the plica inguinalis the inguinal or caudal mesonephric ligament is formed directly subjacent to the coelomic epithelium. It interacts intensively with the mesenchyme sheath of the paramesonephric (Müllerian) duct in stage 21. It is separated by loose mesenchyme from the subjacent mesonephros and mesonephric (Wolffian) duct which therefore it does not pass beneath. In stage 23, and during the early fetal period, the caudal gonadal ligament is formed. It arises from the caudal pole of the gonads and proliferates in the space between the two genital ducts. Only the duct not destined to disappear associates with it. Therefore, in males the gubernaculum consists of the inguinal ligament of the mesonephros only. Its significance for the descent of the testis is discussed. In females the inguinal and the caudal gonadal ligaments fuse into a single strand and together form the gubernaculum.

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Section: Discussionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The development of the caudal ligaments of the mesonephros and of the gonads: a contribution to the development of the human gubernaculum (Hunteri)

Ludwig

1993

Anat Embryol

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“…duplication of parts of the duct and a common basal lamina with the adjacent Wolffian duct. Similarly, Wartenberg [1990] observed a basal lamina common to both ducts in a 21-mm human embryo. These comparisons provide considerable evidence that, in higher vertebrates, the mode of Mül-lerian duct development is identical.…”

Section: Comparison With Human Embryosmentioning

confidence: 73%

Early Development of the Müllerian Duct in Avian Embryos with Reference to the Human

Jacob¹,

Konrad²,

Jacob³

1999

Cells Tissues Organs

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In vertebrates, the female reproductive system arises from the Müllerian (paramesonephric) duct which develops in both sexes under the influence of the Wolffian (mesonephric) duct. For a better understanding of the interactions between the Müllerian duct and its adjacent tissues, we present a systematic scanning and transmission electron microscopic investigation of early stages of avian Müllerian duct development. This starts within the cranial part of the Müllerian ridge from a placode-like thickening and deepening of the coelomic epithelium containing nephrostomes as remnants of the last pronephric and first mesonephric tubules. Groups of cells detach from this placode and rapidly expand caudally as a solid cord. This becomes canalized, but the tip region remains mesenchymal and is found enclosed within the basal lamina of the Wolffian duct. Immunostaining reveals that the Müllerian duct migrates within a matrix rich in laminin and entactin. When the canalized duct has opened into the coelomic cavity, one or more secondary ducts are found immediately caudal of the main funnel, for a short period only, possibly to supply material to the expanding duct. BrdU-anti-BrdU reaction reveals a high proliferation of the duct epithelium. The thickened epithelium of the Müllerian ridge dissolves to form the mesenchymal layers of the duct. Immunostaining with vimentin argues against a cellular contribution of Wolffian duct cells to the Müllerian duct. Comparing the data from avian embryos with those of human indicates that the modalities of early Müllerian duct development are similar in both species.

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Some remarks on the female and male Keimbahn in the light of evolution and history

Hilscher

1999

J. Exp. Zool.

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From the existence of two types of cells for reproduction—the female and male germ cells (GCs)—and by recombination of the genome, evolution proceeded dramatically. Unicellular and multicellular plants frequently are characterized by a sequence of haploid and diploid phases, or generations, with gametes and spores as reproductive cells. Isogamy, anisogamy, and oogamy can be distinguished depending on the GCs that correspond, differ in size, or impose as egg cell and sperm cell. In protozoans, too, species are found in which GCs differ clearly from each other. In the female lineage of angiosperms, a “Keimbahn chain” consisting of five successive germ line cells can be observed. Oogenesis and spermatogenesis are complete in coelenterates and similar in mammals. However, the controlling mechanisms are by far more complex in the latter. This means that the balance of hormonal and vegetative nervous influences (stimulation, inhibition) on gametogenesis is not primarily orientated on the germ line cells themselves, but mostly on the structural and functional situation of the gonads and the individual carriers. This becomes particularly evident in insects, where gametogenesis, on the one side, depends on the development of the rest of the organism but on the other side represents an independent developmental process. The point at which germ line cells and somatic cells separate correlates more or less with the degree of phylogenetic development. In worms, insects, and up to the anurans, a part of the cytoplasm, the so‐called germ plasma, is separated for the development of GCs during oogenesis (preformistic development). However, in urodeles, reptiles, birds, and mammals, GCs and somatic cells cannot be distinguished before gastrulation (epigenetic development). In various species (e.g., in some oligochaetes and snails), there exist “double spermatogenic lines.” In mammals (probably in other vertebrates and perhaps in various phyla of animals, too), the female Keimbahn is provided with only one proliferation system. The male gametogenesis is equipped with two systems: the first corresponds to the female germ line, the second is responsible for the immense number of gametes produced in the mature testes. In mammals the message to become male lies on the Y‐chromosome (on its short arm in man and mouse) and was identified as the gene SRY in human and Sry in mouse. The fertility genes that are responsible for an uninterrupted spermatogenesis, up to fertilizing spermatozoa, are sitting on the long arm of the human Y‐chromosome. J. Exp. Zool. (Mol. Dev. Evol.) 285:197–214, 1999. © 1999 Wiley‐Liss, Inc.

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Entwicklung der Genitalorgane und Bildung der Gameten

Cited by 14 publications

References 63 publications

The development of the caudal ligaments of the mesonephros and of the gonads: a contribution to the development of the human gubernaculum (Hunteri)

The development of the caudal ligaments of the mesonephros and of the gonads: a contribution to the development of the human gubernaculum (Hunteri)

Early Development of the Müllerian Duct in Avian Embryos with Reference to the Human

Some remarks on the female and male Keimbahn in the light of evolution and history

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