title: [The ultrastructure of the primary ureter and of the mesonephritic blastema before its differentiation in Rana dalmatina (Amphibia, Anuran)].
abstract: The mesonephretic blastema is formed by cells with a large nucleus, a dense cytoplasm containing few differentiated organelles. At the contact between the ureter and the mesonephretic blastema, the cells of the primary ureter have special characteristics: existence of an abundant "coat", numerous "villous processes" and a dense network of fibres of collagen.
mesh_terms: D000818:Animals; D001001:Anura; D002448:Cell Adhesion; D002462:Cell Membrane / Q000648:ultrastructure; D002467:Cell Nucleus / Q000648:ultrastructure; D004627:Embryonic Induction; D008650:Mesonephros / Q000648:ultrastructure*; D011898:Ranidae / Q000196:embryology* / Q000648:ultrastructure; D014513:Ureter / Q000196:embryology* / Q000648:ultrastructure
vernacular_title: Observations sur l'ultrastructure de l'uretère primaire et du blastème mésonéphrétique avant sa différenciation chez Rana dalmatina (Amphibien Anoure)