title: [Differentiation of foetal and prepuberty leydig cell in electron microscope (author's transl)].
abstract: A morphometric study of intra-uterine and extra-uterine Leydig cell differentiation was carried out by the Weibel's technique which was adapted for morphometry on electronmicrography. The results obtained in rats, the animals studied in this investigation, were: a) Testis of intra-uterine life as well as those of extra-uterine life displayed Leydig cells with lipid droplets. b) The percentage of Leydig cells varied from one testis to another. c) This percentage increased at 20th day of intra-uterine life and between 60th and 90th day of extra-uterine life. d) The percentage of lipid droplets within cytoplasm of Leydig cell increased at 20th day of intra-uterine life, at 15th day of extra-uterine life and at the proximity of puberty. e) The percentages of mitochondria are at inverse ratio of percentage of lipid droplets until the 40th day of life.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D005260:Female; D005333:Fetus; D005865:Gestational Age; D007985:Leydig Cells / Q000648:ultrastructure*; D008297:Male; D008854:Microscopy, Electron; D011247:Pregnancy; D051381:Rats; D013737:Testis / Q000196:embryology
vernacular_title: Diferenciacão da célula de Leydig fetal e pré-púbere em microscopia electrónica