title: [Regression of chick embryo tail gut. Stage of determination of cell degeneration and role of the associated mesenchyme].
abstract: In chick embryo the complete degeneration of the tail gut is carried out between H and H stages 20 to 24 and cell alterations are noticeable from stage 19. This paper reports a study to ascertain whether degeneration of the tail gut cells is already determined. The tail guts of donor embryos were taken at stages 17 to 20 and implanted into the leg bud of 4 to 5-day host embryos. In another series, stage 19 tail guts were implanted with their associated mesenchyme. The fate of the implants was histologically studied in the hosts at different times during their subsequent development. The younger grafts formed tubular structures almost identical to the normal tail gut. Implanted stage 19 tail guts with practically no mesenchyme did not degenerate; they maintained their structure but did not differentiate further. The tail guts implanted with associated mesenchyme degenerated, and stage 20 tail guts also regressed. The death of the tail gut cells was not determined until the degeneration processes had actually begun, the fate of the tail gut cells depending on their environment.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002470:Cell Survival; D002642:Chick Embryo; D007422:Intestines / Q000196:embryology* / Q000637:transplantation; D013997:Time Factors
vernacular_title: La régression de l'intestin caudal chez l'embryon de poulet. Stade de détermination des dégénérescences cellulaires et rôle du mésenchyme associé.