Am, amniotic cavity; db, decidua basalis; L, Labyrinth; Mt, metanephros; Ms, mesonephros
. Haematoxylin and Eosin stain, B&D (scale bar=100[micro]m).
The first one matches with the present study giving that stages HH14 to HH18 occur during day 3 of development and is related to changes that include the amnion, heart and circulatory system formation; the second peak matches the days 4 and 5 of incubation and is related to possible alterations in the formation of the visceral arches (10), the corion and allantois fusion and the beginning of the functioning of the mesonephros
The role of the mesonephros
in cell differentiation and morphogenesis of the mouse fetal testis.
of the proximal tubules of mesonephros
decreased among the groups with significant difference between control group I and all the experimental groups.
longitudinal division of the urogenital ridge, incomplete degeneration of a part of the mesonephros
and development of peritoneal bands have been suggested, but none can explain all types of polyorchidism. Polyorchidism classification also shows considerable variation between reports.
In similar times, the migration of the primordial germinal cells from the yolk sac leads to the formation of ovaries which arise from mesenchyme and from the epithelium of genital crest of the intermediate mesoderm, with female reproductive tract organogenetic processes different from those of mesonephros
; therefore, the anomalies of Mullerian ducts are not associated, generally, with anomalies of ovary development .
(22-25) Deletion of both PAX8 and PAX2 genes prevents generation of the mesonephric (wolffian) duct and subsequent formation of all three embryonic kidneys (pronephros, mesonephros
, and metanephros).
Left and right gonads were visualized using a Nikon SMZ-U dissecting microscope (Nikon Instruments, Melville, NY), separated from adjacent mesonephros
, and transferred to individual labeled wells of ice-cold transport media until xenografting.
The renal corpuscle and efferent epididymal ducts represent the remnant mesonephros
that is modified for sperm transport.
Immunocytochemical demonstration of insulin in the mesonephros
and metanephros of the brazilian opossum Didelphis albiventris.
In dorsal mesonephros
, primary metanephros kidneys were located (Figure 1) so this structure in fetus that CRL was 30 mm also was observed adhered in their vicinity under vertebral column (Figure 2,3).
Pour sa part, l' endocrinon (systeme endocrinien) regroupe toutes les glandes a secretion interne plus les organes dits recapitulatifs de l'ontogenese: la chorde, les reins embryonnaires, le protonephros et le mesonephros
. "Ces organes ne sont donc pas des vestiges illustrant la loi biogenetique fondamentale; ils participent activement au developpement de la forme de l'individu pendant un laps de temps bien delimite, comme c'est le cas par exemple pour le thymus." (10)